config(3)

NAME

Config - access Perl configuration information

SYNOPSIS

use Config;
if ($Config{'cc'} =~ /gcc/) {
    print "built by gcc0;
}
use Config qw(myconfig config_sh config_vars);
print myconfig();
print config_sh();
config_vars(qw(osname archname));

DESCRIPTION

The Config module contains all the information that was
available to the "Configure" program at Perl build time
(over 900 values).

Shell variables from the config.sh file (written by Con figure) are stored in the readonly-variable %Config,
indexed by their names.

Values stored in config.sh as 'undef' are returned as
undefined values. The perl "exists" function can be used
to check if a named variable exists.

myconfig()

Returns a textual summary of the major perl configura
tion values. See also "-V" in "Switches" in perlrun.

config_sh()

Returns the entire perl configuration information in
the form of the original config.sh shell variable
assignment script.

config_vars(@names)

Prints to STDOUT the values of the named configuration
variable. Each is printed on a separate line in the
form:

name='value';

Names which are unknown are output as
"name='UNKNOWN';". See also "-V:name" in "Switches"
in perlrun.

EXAMPLE

Here's a more sophisticated example of using %Config:

use Config;
use strict;

my %sig_num;
my @sig_name;
unless($Config{sig_name} && $Config{sig_num}) {

die "No sigs?";

} else {

my @names = split ' ', $Config{sig_name};
@sig_num{@names} = split ' ', $Config{sig_num};
foreach (@names) {

$sig_name[$sig_num{$_}] ||= $_;

}

}

print "signal #17 = $sig_name[17]0;
if ($sig_num{ALRM}) {

print "SIGALRM is $sig_num{ALRM}0;

}

WARNING

Because this information is not stored within the perl
executable itself it is possible (but unlikely) that the
information does not relate to the actual perl binary
which is being used to access it.

The Config module is installed into the architecture and
version specific library directory ($Config{installarch
lib}) and it checks the perl version number when loaded.

The values stored in config.sh may be either single-quoted
or double-quoted. Double-quoted strings are handy for
those cases where you need to include escape sequences in
the strings. To avoid runtime variable interpolation, any
"$" and "@" characters are replaced by " and "@",
respectively. This isn't foolproof, of course, so don't
embed " or "@" in double-quoted strings unless you're
willing to deal with the consequences. (The slashes will
end up escaped and the "$" or "@" will trigger variable
interpolation)

GLOSSARY

Most "Config" variables are determined by the "Configure"
script on platforms supported by it (which is most UNIX
platforms). Some platforms have custom-made "Config"
variables, and may thus not have some of the variables
described below, or may have extraneous variables specific
to that particular port. See the port specific documenta
tion in such cases.

_

"_a"

From Unix.U:

This variable defines the extension used for ordinary
library files. For unix, it is .a. The . is
included. Other possible values include .lib.

"_exe"

From Unix.U:

This variable defines the extension used for exe
cutable files. "DJGPP", Cygwin and OS/2 use .exe. Stratus "VOS" uses .pm. On operating systems which do
not require a specific extension for executable files,
this variable is empty.

"_o"

From Unix.U:

This variable defines the extension used for object
files. For unix, it is .o. The . is included. Other
possible values include .obj.

a

"afs"

From afs.U:

This variable is set to "true" if "AFS" (Andrew File
System) is used on the system, "false" otherwise. It
is possible to override this with a hint value or com
mand line option, but you'd better know what you are
doing.

"afsroot"

From afs.U:

This variable is by default set to /afs. In the
unlikely case this is not the correct root, it is pos
sible to override this with a hint value or command
line option. This will be used in subsequent tests
for AFSness in the Perl configure and test process.

"alignbytes"

From alignbytes.U:

This variable holds the number of bytes required to
align a double-- or a long double when applicable.
Usual values are 2, 4 and 8. The default is eight,
for safety.

"ansi2knr"

From ansi2knr.U:

This variable is set if the user needs to run
ansi2knr. Currently, this is not supported, so we
just abort.

"aphostname"

From d_gethname.U:

This variable contains the command which can be used
to compute the host name. The command is fully quali
fied by its absolute path, to make it safe when used
by a process with super-user privileges.

"api_revision"

From patchlevel.U:

The three variables, api_revision, api_version, and
api_subversion, specify the version of the oldest perl
binary compatible with the present perl. In a full
version string such as 5.6.1, api_revision is the 5.
Prior to 5.5.640, the format was a floating point num
ber, like 5.00563.

perl.c:incpush() and lib/lib.pm will automatically search in $sitelib/.. for older directories back to the limit specified by these api_ variables. This is
only useful if you have a perl library directory tree
structured like the default one. See "INSTALL" for
how this works. The versioned site_perl directory was
introduced in 5.005, so that is the lowest possible
value. The version list appropriate for the current
system is determined in inc_version_list.U.

"XXX" To do: Since compatibility can depend on com
pile time options (such as bincompat, longlong, etc.)
it should (perhaps) be set by Configure, but currently
it isn't. Currently, we read a hard-wired value from
patchlevel.h. Perhaps what we ought to do is take the hard-wired value from patchlevel.h but then modify it if the current Configure options warrant. patch_
level.h then would use an #ifdef guard.

"api_subversion"

From patchlevel.U:

The three variables, api_revision, api_version, and
api_subversion, specify the version of the oldest perl
binary compatible with the present perl. In a full
version string such as 5.6.1, api_subversion is the 1.
See api_revision for full details.

"api_version"

From patchlevel.U:

The three variables, api_revision, api_version, and
api_subversion, specify the version of the oldest perl
binary compatible with the present perl. In a full
version string such as 5.6.1, api_version is the 6.
See api_revision for full details. As a special case,
5.5.0 is rendered in the old-style as 5.005. (In the
5.005_0x maintenance series, this was the only ver
sioned directory in $sitelib.)

"api_versionstring"

From patchlevel.U:

This variable combines api_revision, api_version, and
api_subversion in a format such as 5.6.1 (or 5_6_1)
suitable for use as a directory name. This is
filesystem dependent.

"ar"

From Loc.U:

This variable is used internally by Configure to
determine the full pathname (if any) of the ar pro
gram. After Configure runs, the value is reset to a
plain "ar" and is not useful.

"archlib"

From archlib.U:

This variable holds the name of the directory in which
the user wants to put architecture-dependent public
library files for $package. It is most often a local
directory such as /usr/local/lib. Programs using this variable must be prepared to deal with filename expan
sion.

"archlibexp"

From archlib.U:

This variable is the same as the archlib variable, but
is filename expanded at configuration time, for
convenient use.

"archname64"

From use64bits.U:

This variable is used for the 64-bitness part of
$archname.

"archname"

From archname.U:

This variable is a short name to characterize the cur
rent architecture. It is used mainly to construct the
default archlib.

"archobjs"

From Unix.U:

This variable defines any additional objects that must
be linked in with the program on this architecture.
On unix, it is usually empty. It is typically used to
include emulations of unix calls or other facilities.
For perl on OS/2, for example, this would include
os2/os2.obj.

"asctime_r_proto"

From d_asctime_r.U:

This variable encodes the prototype of asctime_r. It
is zero if d_asctime_r is undef, and one of the "REEN
TRANT_PROTO_T_ABC" macros of reentr.h if d_asctime_r is defined.

"awk"

From Loc.U:

This variable is used internally by Configure to
determine the full pathname (if any) of the awk pro
gram. After Configure runs, the value is reset to a
plain "awk" and is not useful.

b

"baserev"

From baserev.U:

The base revision level of this package, from the
.package file.

"bash"

From Loc.U:

This variable is defined but not used by Configure.
The value is a plain '' and is not useful.

"bin"

From bin.U:

This variable holds the name of the directory in which
the user wants to put publicly executable images for
the package in question. It is most often a local
directory such as /usr/local/bin. Programs using this variable must be prepared to deal with ~name substitu
tion.

"binexp"

From bin.U:

This is the same as the bin variable, but is filename
expanded at configuration time, for use in your make
files.

"bison"

From Loc.U:

This variable is used internally by Configure to
determine the full pathname (if any) of the bison pro
gram. After Configure runs, the value is reset to a
plain "bison" and is not useful.

"byacc"

From Loc.U:

This variable is used internally by Configure to
determine the full pathname (if any) of the byacc pro
gram. After Configure runs, the value is reset to a
plain "byacc" and is not useful.

"byteorder"

From byteorder.U:

This variable holds the byte order in a "UV". In the
following, larger digits indicate more significance.
The variable byteorder is either 4321 on a big-endian
machine, or 1234 on a little-endian, or 87654321 on a
Cray ... or 3412 with weird order !

c

"c" From n.U:

This variable contains the causes the echo

command to suppress newline. Other
wise it is null. Correct usage is $echo $n "prompt
for a question: $c".

"castflags"

From d_castneg.U:

This variable contains a flag that precise difficul
ties the compiler has casting odd floating values to
unsigned long: 0 = ok 1 = couldn't cast < 0 2 =
couldn't cast >= 0x80000000 4 = couldn't cast in argu
ment expression list

"cat"

From Loc.U:

This variable is used internally by Configure to
determine the full pathname (if any) of the cat pro
gram. After Configure runs, the value is reset to a
plain "cat" and is not useful.

"cc"

From cc.U:

This variable holds the name of a command to execute a
C compiler which can resolve multiple global refer
ences that happen to have the same name. Usual values
are "cc" and "gcc". Fervent "ANSI" compilers may be
called "c89". "AIX" has xlc.

"cccdlflags"

From dlsrc.U:

This variable contains any special flags that might
need to be passed with "cc -c" to compile modules to
be used to create a shared library that will be used
for dynamic loading. For hpux, this should be +z. It
is up to the makefile to use it.

"ccdlflags"

From dlsrc.U:

This variable contains any special flags that might
need to be passed to cc to link with a shared library
for dynamic loading. It is up to the makefile to use
it. For sunos 4.1, it should be empty.

"ccflags"

From ccflags.U:

This variable contains any additional C compiler flags
desired by the user. It is up to the Makefile to use
this.

"ccflags_uselargefiles"

From uselfs.U:

This variable contains the compiler flags needed by
large file builds and added to ccflags by hints files.

"ccname"

From Checkcc.U:

This can set either by hints files or by Configure.
If using gcc, this is gcc, and if not, usually equal
to cc, unimpressive, no? Some platforms, however,
make good use of this by storing the flavor of the C
compiler being used here. For example if using the
Sun WorkShop suite, ccname will be "workshop".

"ccsymbols"

From Cppsym.U:

The variable contains the symbols defined by the C
compiler alone. The symbols defined by cpp or by cc
when it calls cpp are not in this list, see cppsymbols
and cppccsymbols. The list is a space-separated list
of symbol=value tokens.

"ccversion"

From Checkcc.U:

This can set either by hints files or by Configure.
If using a (non-gcc) vendor cc, this variable may con
tain a version for the compiler.

"cf_by"

From cf_who.U:

Login name of the person who ran the Configure script
and answered the questions. This is used to tag both
config.sh and config_h.SH.

"cf_email"

From cf_email.U:

Electronic mail address of the person who ran Config
ure. This can be used by units that require the user's
e-mail, like MailList.U.

"cf_time"

From cf_who.U:

Holds the output of the "date" command when the con
figuration file was produced. This is used to tag both
config.sh and config_h.SH.

"charsize"

From charsize.U:

This variable contains the value of the "CHARSIZE"
symbol, which indicates to the C program how many
bytes there are in a character.

"chgrp"

From Loc.U:

This variable is defined but not used by Configure.
The value is a plain '' and is not useful.

"chmod"

From Loc.U:

This variable is used internally by Configure to
determine the full pathname (if any) of the chmod pro
gram. After Configure runs, the value is reset to a
plain "chmod" and is not useful.

"chown"

From Loc.U:

This variable is defined but not used by Configure.
The value is a plain '' and is not useful.

"clocktype"

From d_times.U:

This variable holds the type returned by times(). It can be long, or clock_t on "BSD" sites (in which case
<sys/types.h> should be included).

"comm"

From Loc.U:

This variable is used internally by Configure to
determine the full pathname (if any) of the comm pro
gram. After Configure runs, the value is reset to a
plain "comm" and is not useful.

"compress"

From Loc.U:

This variable is defined but not used by Configure.
The value is a plain '' and is not useful.

"contains"

From contains.U:

This variable holds the command to do a grep with a
proper return status. On most sane systems it is
simply "grep". On insane systems it is a grep fol
lowed by a cat followed by a test. This variable is
primarily for the use of other Configure units.

"cp"

From Loc.U:

This variable is used internally by Configure to
determine the full pathname (if any) of the cp pro
gram. After Configure runs, the value is reset to a
plain "cp" and is not useful.

"cpio"

From Loc.U:

This variable is defined but not used by Configure.
The value is a plain '' and is not useful.

"cpp"

From Loc.U:

This variable is used internally by Configure to
determine the full pathname (if any) of the cpp pro
gram. After Configure runs, the value is reset to a
plain "cpp" and is not useful.

"cpp_stuff"

From cpp_stuff.U:

This variable contains an identification of the cate
nation mechanism used by the C preprocessor.

"cppccsymbols"

From Cppsym.U:

The variable contains the symbols defined by the C
compiler when it calls cpp. The symbols defined by
the cc alone or cpp alone are not in this list, see
ccsymbols and cppsymbols. The list is a space-sepa
rated list of symbol=value tokens.

"cppflags"

From ccflags.U:

This variable holds the flags that will be passed to
the C pre- processor. It is up to the Makefile to use
it.

"cpplast"

From cppstdin.U:

This variable has the same functionality as cppminus,
only it applies to cpprun and not cppstdin.

"cppminus"

From cppstdin.U:

This variable contains the second part of the string
which will invoke the C preprocessor on the standard
input and produce to standard output. This variable
will have the value "-" if cppstdin needs a minus to
specify standard input, otherwise the value is "".

"cpprun"

From cppstdin.U:

This variable contains the command which will invoke a
C preprocessor on standard input and put the output to
stdout. It is guaranteed not to be a wrapper and may
be a null string if no preprocessor can be made
directly available. This preprocessor might be differ
ent from the one used by the C compiler. Don't forget
to append cpplast after the preprocessor options.

"cppstdin"

From cppstdin.U:

This variable contains the command which will invoke
the C preprocessor on standard input and put the out
put to stdout. It is primarily used by other Config
ure units that ask about preprocessor symbols.

"cppsymbols"

From Cppsym.U:

The variable contains the symbols defined by the C
preprocessor alone. The symbols defined by cc or by
cc when it calls cpp are not in this list, see ccsym
bols and cppccsymbols. The list is a space-separated
list of symbol=value tokens.

"crypt_r_proto"

From d_crypt_r.U:

This variable encodes the prototype of crypt_r. It is
zero if d_crypt_r is undef, and one of the "REEN
TRANT_PROTO_T_ABC" macros of reentr.h if d_crypt_r is defined.

"cryptlib"

From d_crypt.U:

This variable holds -lcrypt or the path to a
libcrypt.a archive if the crypt() function is not defined in the standard C library. It is up to the
Makefile to use this.

"csh"

From Loc.U:

This variable is used internally by Configure to
determine the full pathname (if any) of the csh pro
gram. After Configure runs, the value is reset to a
plain "csh" and is not useful.

"ctermid_r_proto"

From d_ctermid_r.U:

This variable encodes the prototype of ctermid_r. It
is zero if d_ctermid_r is undef, and one of the "REEN
TRANT_PROTO_T_ABC" macros of reentr.h if d_ctermid_r is defined.

"ctime_r_proto"

From d_ctime_r.U:

This variable encodes the prototype of ctime_r. It is
zero if d_ctime_r is undef, and one of the "REEN
TRANT_PROTO_T_ABC" macros of reentr.h if d_ctime_r is defined.

d

"d__fwalk"

From d__fwalk.U:

This variable conditionally defines "HAS__FWALK" if
_fwalk() is available to apply a function to all the file handles.

"d_access"

From d_access.U:

This variable conditionally defines "HAS_ACCESS" if
the access() system call is available to check for access permissions using real IDs.

"d_accessx"

From d_accessx.U:

This variable conditionally defines the "HAS_ACCESSX"
symbol, which indicates to the C program that the
accessx() routine is available.

"d_alarm"

From d_alarm.U:

This variable conditionally defines the "HAS_ALARM"
symbol, which indicates to the C program that the
alarm() routine is available.

"d_archlib"

From archlib.U:

This variable conditionally defines "ARCHLIB" to hold
the pathname of architecture-dependent library files
for $package. If $archlib is the same as $privlib,
then this is set to undef.

"d_asctime_r"

From d_asctime_r.U:

This variable conditionally defines the "HAS_ASC
TIME_R" symbol, which indicates to the C program that
the asctime_r() routine is available.

"d_atolf"

From atolf.U:

This variable conditionally defines the "HAS_ATOLF"
symbol, which indicates to the C program that the
atolf() routine is available.

"d_atoll"

From atoll.U:

This variable conditionally defines the "HAS_ATOLL"
symbol, which indicates to the C program that the
atoll() routine is available.

"d_attribut"

From d_attribut.U:

This variable conditionally defines "HASATTRIBUTE",
which indicates the C compiler can check for function
attributes, such as printf formats.

"d_bcmp"

From d_bcmp.U:

This variable conditionally defines the "HAS_BCMP"
symbol if the bcmp() routine is available to compare
strings.

"d_bcopy"

From d_bcopy.U:

This variable conditionally defines the "HAS_BCOPY"
symbol if the bcopy() routine is available to copy
strings.

"d_bsd"

From Guess.U:

This symbol conditionally defines the symbol "BSD"
when running on a "BSD" system.

"d_bsdgetpgrp"

From d_getpgrp.U:

This variable conditionally defines "USE_BSD_GETPGRP"
if getpgrp needs one arguments whereas "USG" one needs
none.

"d_bsdsetpgrp"

From d_setpgrp.U:

This variable conditionally defines "USE_BSD_SETPGRP"
if setpgrp needs two arguments whereas "USG" one needs
none. See also d_setpgid for a "POSIX" interface.

"d_bzero"

From d_bzero.U:

This variable conditionally defines the "HAS_BZERO"
symbol if the bzero() routine is available to set mem ory to 0.

"d_casti32"

From d_casti32.U:

This variable conditionally defines CASTI32, which
indicates whether the C compiler can cast large floats
to 32-bit ints.

"d_castneg"

From d_castneg.U:

This variable conditionally defines "CASTNEG", which
indicates wether the C compiler can cast negative
float to unsigned.

"d_charvspr"

From d_vprintf.U:

This variable conditionally defines "CHARVSPRINTF" if
this system has vsprintf returning type (char*). The
trend seems to be to declare it as "int vsprintf()".

"d_chown"

From d_chown.U:

This variable conditionally defines the "HAS_CHOWN"
symbol, which indicates to the C program that the
chown() routine is available.

"d_chroot"

From d_chroot.U:

This variable conditionally defines the "HAS_CHROOT"
symbol, which indicates to the C program that the
chroot() routine is available.

"d_chsize"

From d_chsize.U:

This variable conditionally defines the "CHSIZE" sym
bol, which indicates to the C program that the
chsize() routine is available to truncate files. You might need a -lx to get this routine.

"d_class"

From d_class.U:

This variable conditionally defines the "HAS_CLASS"
symbol, which indicates to the C program that the
class() routine is available.

"d_closedir"

From d_closedir.U:

This variable conditionally defines "HAS_CLOSEDIR" if
closedir() is available.

"d_cmsghdr_s"

From d_cmsghdr_s.U:

This variable conditionally defines the
"HAS_STRUCT_CMSGHDR" symbol, which indicates that the
struct cmsghdr is supported.

"d_const"

From d_const.U:

This variable conditionally defines the "HASCONST"
symbol, which indicates to the C program that this C
compiler knows about the const type.

"d_crypt"

From d_crypt.U:

This variable conditionally defines the "CRYPT" sym
bol, which indicates to the C program that the crypt() routine is available to encrypt passwords and the
like.

"d_crypt_r"

From d_crypt_r.U:

This variable conditionally defines the "HAS_CRYPT_R"
symbol, which indicates to the C program that the
crypt_r() routine is available.

"d_csh"

From d_csh.U:

This variable conditionally defines the "CSH" symbol,
which indicates to the C program that the C-shell
exists.

"d_ctermid_r"

From d_ctermid_r.U:

This variable conditionally defines the "HAS_CTER
MID_R" symbol, which indicates to the C program that
the ctermid_r() routine is available.

"d_ctime_r"

From d_ctime_r.U:

This variable conditionally defines the "HAS_CTIME_R"
symbol, which indicates to the C program that the
ctime_r() routine is available.

"d_cuserid"

From d_cuserid.U:

This variable conditionally defines the "HAS_CUSERID"
symbol, which indicates to the C program that the
cuserid() routine is available to get character login names.

"d_dbl_dig"

From d_dbl_dig.U:

This variable conditionally defines d_dbl_dig if this
system's header files provide "DBL_DIG", which is the
number of significant digits in a double precision
number.

"d_dbminitproto"

From d_dbminitproto.U:

This variable conditionally defines the
"HAS_DBMINIT_PROTO" symbol, which indicates to the C
program that the system provides a prototype for the
dbminit() function. Otherwise, it is up to the pro gram to supply one.

"d_difftime"

From d_difftime.U:

This variable conditionally defines the "HAS_DIFFTIME"
symbol, which indicates to the C program that the
difftime() routine is available.

"d_dirfd"

From d_dirfd.U:

This variable conditionally defines the "HAS_DIRFD"
constant, which indicates to the C program that
dirfd() is available to return the file descriptor of a directory stream.

"d_dirnamlen"

From i_dirent.U:

This variable conditionally defines "DIRNAMLEN", which
indicates to the C program that the length of direc
tory entry names is provided by a d_namelen field.

"d_dlerror"

From d_dlerror.U:

This variable conditionally defines the "HAS_DLERROR"
symbol, which indicates to the C program that the
dlerror() routine is available.

"d_dlopen"

From d_dlopen.U:

This variable conditionally defines the "HAS_DLOPEN"
symbol, which indicates to the C program that the
dlopen() routine is available.

"d_dlsymun"

From d_dlsymun.U:

This variable conditionally defines
"DLSYM_NEEDS_UNDERSCORE", which indicates that we need
to prepend an underscore to the symbol name before
calling dlsym().

"d_dosuid"

From d_dosuid.U:

This variable conditionally defines the symbol
"DOSUID", which tells the C program that it should
insert setuid emulation code on hosts which have
setuid #! scripts disabled.

"d_drand48_r"

From d_drand48_r.U:

This variable conditionally defines the HAS_DRAND48_R
symbol, which indicates to the C program that the
drand48_r() routine is available.

"d_drand48proto"

From d_drand48proto.U:

This variable conditionally defines the
HAS_DRAND48_PROTO symbol, which indicates to the C
program that the system provides a prototype for the
drand48() function. Otherwise, it is up to the pro gram to supply one.

"d_dup2"

From d_dup2.U:

This variable conditionally defines HAS_DUP2 if dup2() is available to duplicate file descriptors.

"d_eaccess"

From d_eaccess.U:

This variable conditionally defines the "HAS_EACCESS"
symbol, which indicates to the C program that the eac_
cess() routine is available.

"d_endgrent"

From d_endgrent.U:

This variable conditionally defines the "HAS_ENDGRENT"
symbol, which indicates to the C program that the end_
grent() routine is available for sequential access of the group database.

"d_endgrent_r"

From d_endgrent_r.U:

This variable conditionally defines the "HAS_END
GRENT_R" symbol, which indicates to the C program that
the endgrent_r() routine is available.

"d_endhent"

From d_endhent.U:

This variable conditionally defines "HAS_ENDHOSTENT"
if endhostent() is available to close whatever was being used for host queries.

"d_endhostent_r"

From d_endhostent_r.U:

This variable conditionally defines the "HAS_ENDHOS
TENT_R" symbol, which indicates to the C program that
the endhostent_r() routine is available.

"d_endnent"

From d_endnent.U:

This variable conditionally defines "HAS_ENDNETENT" if
endnetent() is available to close whatever was being used for network queries.

"d_endnetent_r"

From d_endnetent_r.U:

This variable conditionally defines the "HAS_ENDNE
TENT_R" symbol, which indicates to the C program that
the endnetent_r() routine is available.

"d_endpent"

From d_endpent.U:

This variable conditionally defines "HAS_ENDPROTOENT"
if endprotoent() is available to close whatever was being used for protocol queries.

"d_endprotoent_r"

From d_endprotoent_r.U:

This variable conditionally defines the "HAS_ENDPRO
TOENT_R" symbol, which indicates to the C program that
the endprotoent_r() routine is available.

"d_endpwent"

From d_endpwent.U:

This variable conditionally defines the "HAS_ENDPWENT"
symbol, which indicates to the C program that the end_
pwent() routine is available for sequential access of the passwd database.

"d_endpwent_r"

From d_endpwent_r.U:

This variable conditionally defines the "HAS_ENDP
WENT_R" symbol, which indicates to the C program that
the endpwent_r() routine is available.

"d_endsent"

From d_endsent.U:

This variable conditionally defines "HAS_ENDSERVENT"
if endservent() is available to close whatever was being used for service queries.

"d_endservent_r"

From d_endservent_r.U:

This variable conditionally defines the "HAS_ENDSER
VENT_R" symbol, which indicates to the C program that
the endservent_r() routine is available.

"d_eofnblk"

From nblock_io.U:

This variable conditionally defines "EOF_NONBLOCK" if
"EOF" can be seen when reading from a non-blocking I/O
source.

"d_eunice"

From Guess.U:

This variable conditionally defines the symbols
"EUNICE" and "VAX", which alerts the C program that it
must deal with ideosyncracies of "VMS".

"d_fchdir"

From d_fchdir.U:

This variable conditionally defines the "HAS_FCHDIR"
symbol, which indicates to the C program that the
fchdir() routine is available.

"d_fchmod"

From d_fchmod.U:

This variable conditionally defines the "HAS_FCHMOD"
symbol, which indicates to the C program that the fch_
mod() routine is available to change mode of opened
files.

"d_fchown"

From d_fchown.U:

This variable conditionally defines the "HAS_FCHOWN"
symbol, which indicates to the C program that the
fchown() routine is available to change ownership of opened files.

"d_fcntl"

From d_fcntl.U:

This variable conditionally defines the "HAS_FCNTL"
symbol, and indicates whether the fcntl() function
exists

"d_fcntl_can_lock"

From d_fcntl_can_lock.U:

This variable conditionally defines the
"FCNTL_CAN_LOCK" symbol and indicates whether file
locking with fcntl() works.

"d_fd_macros"

From d_fd_set.U:

This variable contains the eventual value of the
"HAS_FD_MACROS" symbol, which indicates if your C com
piler knows about the macros which manipulate an
fd_set.

"d_fd_set"

From d_fd_set.U:

This variable contains the eventual value of the
"HAS_FD_SET" symbol, which indicates if your C com
piler knows about the fd_set typedef.

"d_fds_bits"

From d_fd_set.U:

This variable contains the eventual value of the
"HAS_FDS_BITS" symbol, which indicates if your fd_set
typedef contains the fds_bits member. If you have an
fd_set typedef, but the dweebs who installed it did a
half-fast job and neglected to provide the macros to
manipulate an fd_set, "HAS_FDS_BITS" will let us know
how to fix the gaffe.

"d_fgetpos"

From d_fgetpos.U:

This variable conditionally defines "HAS_FGETPOS" if
fgetpos() is available to get the file position indi cator.

"d_finite"

From d_finite.U:

This variable conditionally defines the "HAS_FINITE"
symbol, which indicates to the C program that the
finite() routine is available.

"d_finitel"

From d_finitel.U:

This variable conditionally defines the "HAS_FINITEL"
symbol, which indicates to the C program that the
finitel() routine is available.

"d_flexfnam"

From d_flexfnam.U:

This variable conditionally defines the "FLEXFILE
NAMES" symbol, which indicates that the system sup
ports filenames longer than 14 characters.

"d_flock"

From d_flock.U:

This variable conditionally defines "HAS_FLOCK" if
flock() is available to do file locking.

"d_flockproto"

From d_flockproto.U:

This variable conditionally defines the
"HAS_FLOCK_PROTO" symbol, which indicates to the C
program that the system provides a prototype for the
flock() function. Otherwise, it is up to the program to supply one.

"d_fork"

From d_fork.U:

This variable conditionally defines the "HAS_FORK"
symbol, which indicates to the C program that the
fork() routine is available.

"d_fp_class"

From d_fp_class.U:

This variable conditionally defines the "HAS_FP_CLASS"
symbol, which indicates to the C program that the
fp_class() routine is available.

"d_fpathconf"

From d_pathconf.U:

This variable conditionally defines the "HAS_FPATH
CONF" symbol, which indicates to the C program that
the pathconf() routine is available to determine filesystem related limits and options associated with a
given open file descriptor.

"d_fpclass"

From d_fpclass.U:

This variable conditionally defines the "HAS_FPCLASS"
symbol, which indicates to the C program that the
fpclass() routine is available.

"d_fpclassify"

From d_fpclassify.U:

This variable conditionally defines the "HAS_FPCLAS
SIFY" symbol, which indicates to the C program that
the fpclassify() routine is available.

"d_fpclassl"

From d_fpclassl.U:

This variable conditionally defines the "HAS_FPCLASSL"
symbol, which indicates to the C program that the
fpclassl() routine is available.

"d_fpos64_t"

From d_fpos64_t.U:

This symbol will be defined if the C compiler supports
fpos64_t.

"d_frexpl"

From d_frexpl.U:

This variable conditionally defines the "HAS_FREXPL"
symbol, which indicates to the C program that the
frexpl() routine is available.

"d_fs_data_s"

From d_fs_data_s.U:

This variable conditionally defines the
"HAS_STRUCT_FS_DATA" symbol, which indicates that the
struct fs_data is supported.

"d_fseeko"

From d_fseeko.U:

This variable conditionally defines the "HAS_FSEEKO"
symbol, which indicates to the C program that the
fseeko() routine is available.

"d_fsetpos"

From d_fsetpos.U:

This variable conditionally defines "HAS_FSETPOS" if
fsetpos() is available to set the file position indi cator.

"d_fstatfs"

From d_fstatfs.U:

This variable conditionally defines the "HAS_FSTATFS"
symbol, which indicates to the C program that the
fstatfs() routine is available.

"d_fstatvfs"

From d_statvfs.U:

This variable conditionally defines the "HAS_FSTATVFS"
symbol, which indicates to the C program that the
fstatvfs() routine is available.

"d_fsync"

From d_fsync.U:

This variable conditionally defines the "HAS_FSYNC"
symbol, which indicates to the C program that the
fsync() routine is available.

"d_ftello"

From d_ftello.U:

This variable conditionally defines the "HAS_FTELLO"
symbol, which indicates to the C program that the
ftello() routine is available.

"d_ftime"

From d_ftime.U:

This variable conditionally defines the "HAS_FTIME"
symbol, which indicates that the ftime() routine
exists. The ftime() routine is basically a sub-second accuracy clock.

"d_Gconvert"

From d_gconvert.U:

This variable holds what Gconvert is defined as to
convert floating point numbers into strings. By
default, Configure sets "this" macro to use the first
of gconvert, gcvt, or sprintf that pass
sprintf-%g-like behaviour tests. If perl is using
long doubles, the macro uses the first of the follow
ing functions that pass Configure's tests: qgcvt,
sprintf (if Configure knows how to make sprintf format
long doubles--see sPRIgldbl), gconvert, gcvt, and
sprintf (casting to double). The gconvert_preference
and gconvert_ld_preference variables can be used to
alter Configure's preferences, for doubles and long
doubles, respectively. If present, they contain a
space-separated list of one or more of the above func
tion names in the order they should be tried.

d_Gconvert may be set to override Configure with a
platform- specific function. If this function expects
a double, a different value may need to be set by the
uselongdouble.cbu call-back unit so that long doubles can be formatted without loss of precision.

"d_getcwd"

From d_getcwd.U:

This variable conditionally defines the "HAS_GETCWD"
symbol, which indicates to the C program that the
getcwd() routine is available to get the current work ing directory.

"d_getespwnam"

From d_getespwnam.U:

This variable conditionally defines "HAS_GETESPWNAM"
if getespwnam() is available to retrieve enchanced (shadow) password entries by name.

"d_getfsstat"

From d_getfsstat.U:

This variable conditionally defines the "HAS_GETFS
STAT" symbol, which indicates to the C program that
the getfsstat() routine is available.

"d_getgrent"

From d_getgrent.U:

This variable conditionally defines the "HAS_GETGRENT"
symbol, which indicates to the C program that the get_
grent() routine is available for sequential access of the group database.

"d_getgrent_r"

From d_getgrent_r.U:

This variable conditionally defines the "HAS_GET
GRENT_R" symbol, which indicates to the C program that
the getgrent_r() routine is available.

"d_getgrgid_r"

From d_getgrgid_r.U:

This variable conditionally defines the "HAS_GET
GRGID_R" symbol, which indicates to the C program that
the getgrgid_r() routine is available.

"d_getgrnam_r"

From d_getgrnam_r.U:

This variable conditionally defines the "HAS_GETGR
NAM_R" symbol, which indicates to the C program that
the getgrnam_r() routine is available.

"d_getgrps"

From d_getgrps.U:

This variable conditionally defines the "HAS_GET
GROUPS" symbol, which indicates to the C program that
the getgroups() routine is available to get the list of process groups.

"d_gethbyaddr"

From d_gethbyad.U:

This variable conditionally defines the "HAS_GETHOST
BYADDR" symbol, which indicates to the C program that
the gethostbyaddr() routine is available to look up hosts by their "IP" addresses.

"d_gethbyname"

From d_gethbynm.U:

This variable conditionally defines the "HAS_GETHOST
BYNAME" symbol, which indicates to the C program that
the gethostbyname() routine is available to look up host names in some data base or other.

"d_gethent"

From d_gethent.U:

This variable conditionally defines "HAS_GETHOSTENT"
if gethostent() is available to look up host names in some data base or another.

"d_gethname"

From d_gethname.U:

This variable conditionally defines the "HAS_GETHOST
NAME" symbol, which indicates to the C program that
the gethostname() routine may be used to derive the host name.

"d_gethostbyaddr_r"

From d_gethostbyaddr_r.U:

This variable conditionally defines the "HAS_GETHOST
BYADDR_R" symbol, which indicates to the C program
that the gethostbyaddr_r() routine is available.

"d_gethostbyname_r"

From d_gethostbyname_r.U:

This variable conditionally defines the "HAS_GETHOST
BYNAME_R" symbol, which indicates to the C program
that the gethostbyname_r() routine is available.

"d_gethostent_r"

From d_gethostent_r.U:

This variable conditionally defines the "HAS_GETHOS
TENT_R" symbol, which indicates to the C program that
the gethostent_r() routine is available.

"d_gethostprotos"

From d_gethostprotos.U:

This variable conditionally defines the "HAS_GETH
OST_PROTOS" symbol, which indicates to the C program
that <netdb.h> supplies prototypes for the various
gethost*() functions. See also netdbtype.U for prob ing for various netdb types.

"d_getitimer"

From d_getitimer.U:

This variable conditionally defines the
"HAS_GETITIMER" symbol, which indicates to the C pro
gram that the getitimer() routine is available.

"d_getlogin"

From d_getlogin.U:

This variable conditionally defines the "HAS_GETLOGIN"
symbol, which indicates to the C program that the get_
login() routine is available to get the login name.

"d_getlogin_r"

From d_getlogin_r.U:

This variable conditionally defines the "HAS_GETLO
GIN_R" symbol, which indicates to the C program that
the getlogin_r() routine is available.

"d_getmnt"

From d_getmnt.U:

This variable conditionally defines the "HAS_GETMNT"
symbol, which indicates to the C program that the
getmnt() routine is available to retrieve one or more mount info blocks by filename.

"d_getmntent"

From d_getmntent.U:

This variable conditionally defines the "HAS_GETMN
TENT" symbol, which indicates to the C program that
the getmntent() routine is available to iterate through mounted files to get their mount info.

"d_getnbyaddr"

From d_getnbyad.U:

This variable conditionally defines the "HAS_GETNET
BYADDR" symbol, which indicates to the C program that
the getnetbyaddr() routine is available to look up networks by their "IP" addresses.

"d_getnbyname"

From d_getnbynm.U:

This variable conditionally defines the "HAS_GETNETBY
NAME" symbol, which indicates to the C program that
the getnetbyname() routine is available to look up networks by their names.

"d_getnent"

From d_getnent.U:

This variable conditionally defines "HAS_GETNETENT" if
getnetent() is available to look up network names in some data base or another.

"d_getnetbyaddr_r"

From d_getnetbyaddr_r.U:

This variable conditionally defines the "HAS_GETNET
BYADDR_R" symbol, which indicates to the C program
that the getnetbyaddr_r() routine is available.

"d_getnetbyname_r"

From d_getnetbyname_r.U:

This variable conditionally defines the "HAS_GETNETBY
NAME_R" symbol, which indicates to the C program that
the getnetbyname_r() routine is available.

"d_getnetent_r"

From d_getnetent_r.U:

This variable conditionally defines the "HAS_GETNE
TENT_R" symbol, which indicates to the C program that
the getnetent_r() routine is available.

"d_getnetprotos"

From d_getnetprotos.U:

This variable conditionally defines the "HAS_GET
NET_PROTOS" symbol, which indicates to the C program
that <netdb.h> supplies prototypes for the various
getnet*() functions. See also netdbtype.U for probing for various netdb types.

"d_getpagsz"

From d_getpagsz.U:

This variable conditionally defines "HAS_GETPAGESIZE"
if getpagesize() is available to get the system page size.

"d_getpbyname"

From d_getprotby.U:

This variable conditionally defines the "HAS_GETPROTO
BYNAME" symbol, which indicates to the C program that
the getprotobyname() routine is available to look up protocols by their name.

"d_getpbynumber"

From d_getprotby.U:

This variable conditionally defines the "HAS_GETPROTO
BYNUMBER" symbol, which indicates to the C program
that the getprotobynumber() routine is available to look up protocols by their number.

"d_getpent"

From d_getpent.U:

This variable conditionally defines "HAS_GETPROTOENT"
if getprotoent() is available to look up protocols in some data base or another.

"d_getpgid"

From d_getpgid.U:

This variable conditionally defines the "HAS_GETPGID"
symbol, which indicates to the C program that the
getpgid(pid) function is available to get the process
group id.

"d_getpgrp2"

From d_getpgrp2.U:

This variable conditionally defines the HAS_GETPGRP2
symbol, which indicates to the C program that the
getpgrp2() (as in DG/"UX") routine is available to get the current process group.

"d_getpgrp"

From d_getpgrp.U:

This variable conditionally defines "HAS_GETPGRP" if
getpgrp() is available to get the current process group.

"d_getppid"

From d_getppid.U:

This variable conditionally defines the "HAS_GETPPID"
symbol, which indicates to the C program that the
getppid() routine is available to get the parent pro cess "ID".

"d_getprior"

From d_getprior.U:

This variable conditionally defines "HAS_GETPRIORITY"
if getpriority() is available to get a process's pri ority.

"d_getprotobyname_r"

From d_getprotobyname_r.U:

This variable conditionally defines the "HAS_GETPROTO
BYNAME_R" symbol, which indicates to the C program
that the getprotobyname_r() routine is available.

"d_getprotobynumber_r"

From d_getprotobynumber_r.U:

This variable conditionally defines the "HAS_GETPROTO
BYNUMBER_R" symbol, which indicates to the C program
that the getprotobynumber_r() routine is available.

"d_getprotoent_r"

From d_getprotoent_r.U:

This variable conditionally defines the "HAS_GETPRO
TOENT_R" symbol, which indicates to the C program that
the getprotoent_r() routine is available.

"d_getprotoprotos"

From d_getprotoprotos.U:

This variable conditionally defines the "HAS_GET
PROTO_PROTOS" symbol, which indicates to the C program
that <netdb.h> supplies prototypes for the various
getproto*() functions. See also netdbtype.U for prob ing for various netdb types.

"d_getprpwnam"

From d_getprpwnam.U:

This variable conditionally defines "HAS_GETPRPWNAM"
if getprpwnam() is available to retrieve protected (shadow) password entries by name.

"d_getpwent"

From d_getpwent.U:

This variable conditionally defines the "HAS_GETPWENT"
symbol, which indicates to the C program that the get_
pwent() routine is available for sequential access of the passwd database.

"d_getpwent_r"

From d_getpwent_r.U:

This variable conditionally defines the "HAS_GETP
WENT_R" symbol, which indicates to the C program that
the getpwent_r() routine is available.

"d_getpwnam_r"

From d_getpwnam_r.U:

This variable conditionally defines the "HAS_GETPW
NAM_R" symbol, which indicates to the C program that
the getpwnam_r() routine is available.

"d_getpwuid_r"

From d_getpwuid_r.U:

This variable conditionally defines the "HAS_GETP
WUID_R" symbol, which indicates to the C program that
the getpwuid_r() routine is available.

"d_getsbyname"

From d_getsrvby.U:

This variable conditionally defines the "HAS_GET
SERVBYNAME" symbol, which indicates to the C program
that the getservbyname() routine is available to look up services by their name.

"d_getsbyport"

From d_getsrvby.U:

This variable conditionally defines the "HAS_GET
SERVBYPORT" symbol, which indicates to the C program
that the getservbyport() routine is available to look up services by their port.

"d_getsent"

From d_getsent.U:

This variable conditionally defines "HAS_GETSERVENT"
if getservent() is available to look up network ser vices in some data base or another.

"d_getservbyname_r"

From d_getservbyname_r.U:

This variable conditionally defines the "HAS_GET
SERVBYNAME_R" symbol, which indicates to the C program
that the getservbyname_r() routine is available.

"d_getservbyport_r"

From d_getservbyport_r.U:

This variable conditionally defines the "HAS_GET
SERVBYPORT_R" symbol, which indicates to the C program
that the getservbyport_r() routine is available.

"d_getservent_r"

From d_getservent_r.U:

This variable conditionally defines the "HAS_GETSER
VENT_R" symbol, which indicates to the C program that
the getservent_r() routine is available.

"d_getservprotos"

From d_getservprotos.U:

This variable conditionally defines the "HAS_GET
SERV_PROTOS" symbol, which indicates to the C program
that <netdb.h> supplies prototypes for the various
getserv*() functions. See also netdbtype.U for prob ing for various netdb types.

"d_getspnam"

From d_getspnam.U:

This variable conditionally defines "HAS_GETSPNAM" if
getspnam() is available to retrieve SysV shadow pass word entries by name.

"d_getspnam_r"

From d_getspnam_r.U:

This variable conditionally defines the "HAS_GETSP
NAM_R" symbol, which indicates to the C program that
the getspnam_r() routine is available.

"d_gettimeod"

From d_ftime.U:

This variable conditionally defines the "HAS_GETTIME
OFDAY" symbol, which indicates that the gettimeofday() system call exists (to obtain a sub-second accuracy
clock). You should probably include <sys/resource.h>.

"d_gmtime_r"

From d_gmtime_r.U:

This variable conditionally defines the "HAS_GMTIME_R"
symbol, which indicates to the C program that the
gmtime_r() routine is available.

"d_gnulibc"

From d_gnulibc.U:

Defined if we're dealing with the "GNU" C Library.

"d_grpasswd"

From i_grp.U:

This variable conditionally defines "GRPASSWD", which
indicates that struct group in <grp.h> contains
gr_passwd.

"d_hasmntopt"

From d_hasmntopt.U:

This variable conditionally defines the "HAS_HASMN
TOPT" symbol, which indicates to the C program that
the hasmntopt() routine is available to query the mount options of file systems.

"d_htonl"

From d_htonl.U:

This variable conditionally defines "HAS_HTONL" if
htonl() and its friends are available to do network
order byte swapping.

"d_index"

From d_strchr.U:

This variable conditionally defines "HAS_INDEX" if
index() and rindex() are available for string search ing.

"d_inetaton"

From d_inetaton.U:

This variable conditionally defines the
"HAS_INET_ATON" symbol, which indicates to the C pro
gram that the inet_aton() function is available to parse "IP" address "dotted-quad" strings.

"d_int64_t"

From d_int64_t.U:

This symbol will be defined if the C compiler supports
int64_t.

"d_isascii"

From d_isascii.U:

This variable conditionally defines the "HAS_ISASCII"
constant, which indicates to the C program that isas_
cii() is available.

"d_isfinite"

From d_isfinite.U:

This variable conditionally defines the "HAS_ISFINITE"
symbol, which indicates to the C program that the
isfinite() routine is available.

"d_isinf"

From d_isinf.U:

This variable conditionally defines the "HAS_ISINF"
symbol, which indicates to the C program that the
isinf() routine is available.

"d_isnan"

From d_isnan.U:

This variable conditionally defines the "HAS_ISNAN"
symbol, which indicates to the C program that the
isnan() routine is available.

"d_isnanl"

From d_isnanl.U:

This variable conditionally defines the "HAS_ISNANL"
symbol, which indicates to the C program that the
isnanl() routine is available.

"d_killpg"

From d_killpg.U:

This variable conditionally defines the "HAS_KILLPG"
symbol, which indicates to the C program that the
killpg() routine is available to kill process groups.

"d_lchown"

From d_lchown.U:

This variable conditionally defines the "HAS_LCHOWN"
symbol, which indicates to the C program that the
lchown() routine is available to operate on a symbolic link (instead of following the link).

"d_ldbl_dig"

From d_ldbl_dig.U:

This variable conditionally defines d_ldbl_dig if this
system's header files provide "LDBL_DIG", which is the
number of significant digits in a long double preci
sion number.

"d_link"

From d_link.U:

This variable conditionally defines "HAS_LINK" if
link() is available to create hard links.

"d_localtime_r"

From d_localtime_r.U:

This variable conditionally defines the "HAS_LOCAL
TIME_R" symbol, which indicates to the C program that
the localtime_r() routine is available.

"d_locconv"

From d_locconv.U:

This variable conditionally defines "HAS_LOCALECONV"
if localeconv() is available for numeric and monetary formatting conventions.

"d_lockf"

From d_lockf.U:

This variable conditionally defines "HAS_LOCKF" if
lockf() is available to do file locking.

"d_longdbl"

From d_longdbl.U:

This variable conditionally defines "HAS_LONG_DOUBLE"
if the long double type is supported.

"d_longlong"

From d_longlong.U:

This variable conditionally defines "HAS_LONG_LONG" if
the long long type is supported.

"d_lseekproto"

From d_lseekproto.U:

This variable conditionally defines the
"HAS_LSEEK_PROTO" symbol, which indicates to the C
program that the system provides a prototype for the
lseek() function. Otherwise, it is up to the program to supply one.

"d_lstat"

From d_lstat.U:

This variable conditionally defines "HAS_LSTAT" if
lstat() is available to do file stats on symbolic
links.

"d_madvise"

From d_madvise.U:

This variable conditionally defines "HAS_MADVISE" if
madvise() is available to map a file into memory.

"d_mblen"

From d_mblen.U:

This variable conditionally defines the "HAS_MBLEN"
symbol, which indicates to the C program that the
mblen() routine is available to find the number of
bytes in a multibye character.

"d_mbstowcs"

From d_mbstowcs.U:

This variable conditionally defines the "HAS_MBSTOWCS"
symbol, which indicates to the C program that the
mbstowcs() routine is available to convert a multibyte string into a wide character string.

"d_mbtowc"

From d_mbtowc.U:

This variable conditionally defines the "HAS_MBTOWC"
symbol, which indicates to the C program that the
mbtowc() routine is available to convert multibyte to a wide character.

"d_memchr"

From d_memchr.U:

This variable conditionally defines the "HAS_MEMCHR"
symbol, which indicates to the C program that the mem_
chr() routine is available to locate characters within
a C string.

"d_memcmp"

From d_memcmp.U:

This variable conditionally defines the "HAS_MEMCMP"
symbol, which indicates to the C program that the mem_
cmp() routine is available to compare blocks of mem
ory.

"d_memcpy"

From d_memcpy.U:

This variable conditionally defines the "HAS_MEMCPY"
symbol, which indicates to the C program that the mem_
cpy() routine is available to copy blocks of memory.

"d_memmove"

From d_memmove.U:

This variable conditionally defines the "HAS_MEMMOVE"
symbol, which indicates to the C program that the mem_
move() routine is available to copy potentatially
overlapping blocks of memory.

"d_memset"

From d_memset.U:

This variable conditionally defines the "HAS_MEMSET"
symbol, which indicates to the C program that the mem_
set() routine is available to set blocks of memory.

"d_mkdir"

From d_mkdir.U:

This variable conditionally defines the "HAS_MKDIR"
symbol, which indicates to the C program that the
mkdir() routine is available to create directories..

"d_mkdtemp"

From d_mkdtemp.U:

This variable conditionally defines the "HAS_MKDTEMP"
symbol, which indicates to the C program that the
mkdtemp() routine is available to exclusively create a uniquely named temporary directory.

"d_mkfifo"

From d_mkfifo.U:

This variable conditionally defines the "HAS_MKFIFO"
symbol, which indicates to the C program that the
mkfifo() routine is available.

"d_mkstemp"

From d_mkstemp.U:

This variable conditionally defines the "HAS_MKSTEMP"
symbol, which indicates to the C program that the
mkstemp() routine is available to exclusively create and open a uniquely named temporary file.

"d_mkstemps"

From d_mkstemps.U:

This variable conditionally defines the "HAS_MKSTEMPS"
symbol, which indicates to the C program that the
mkstemps() routine is available to exclusively create and open a uniquely named (with a suffix) temporary
file.

"d_mktime"

From d_mktime.U:

This variable conditionally defines the "HAS_MKTIME"
symbol, which indicates to the C program that the
mktime() routine is available.

"d_mmap"

From d_mmap.U:

This variable conditionally defines "HAS_MMAP" if
mmap() is available to map a file into memory.

"d_modfl"

From d_modfl.U:

This variable conditionally defines the "HAS_MODFL"
symbol, which indicates to the C program that the
modfl() routine is available.

"d_modfl_pow32_bug"

From d_modfl.U:

This variable conditionally defines the
HAS_MODFL_POW32_BUG symbol, which indicates that
modfl() is broken for long doubles >= pow(2, 32). For example from 4294967303.150000 one would get
4294967302.000000 and 1.150000. The bug has been seen
in certain versions of glibc, release 2.2.2 is known
to be okay.

"d_mprotect"

From d_mprotect.U:

This variable conditionally defines "HAS_MPROTECT" if
mprotect() is available to modify the access protec tion of a memory mapped file.

"d_msg"

From d_msg.U:

This variable conditionally defines the "HAS_MSG" sym
bol, which indicates that the entire msg*(2) library
is present.

"d_msg_ctrunc"

From d_socket.U:

This variable conditionally defines the
"HAS_MSG_CTRUNC" symbol, which indicates that the
"MSG_CTRUNC" is available. #ifdef is not enough
because it may be an enum, glibc has been known to do
this.

"d_msg_dontroute"

From d_socket.U:

This variable conditionally defines the "HAS_MSG_DON
TROUTE" symbol, which indicates that the "MSG_DON
TROUTE" is available. #ifdef is not enough because it
may be an enum, glibc has been known to do this.

"d_msg_oob"

From d_socket.U:

This variable conditionally defines the "HAS_MSG_OOB"
symbol, which indicates that the "MSG_OOB" is avail
able. #ifdef is not enough because it may be an enum,
glibc has been known to do this.

"d_msg_peek"

From d_socket.U:

This variable conditionally defines the "HAS_MSG_PEEK"
symbol, which indicates that the "MSG_PEEK" is avail
able. #ifdef is not enough because it may be an enum,
glibc has been known to do this.

"d_msg_proxy"

From d_socket.U:

This variable conditionally defines the
"HAS_MSG_PROXY" symbol, which indicates that the
"MSG_PROXY" is available. #ifdef is not enough
because it may be an enum, glibc has been known to do
this.

"d_msgctl"

From d_msgctl.U:

This variable conditionally defines the "HAS_MSGCTL"
symbol, which indicates to the C program that the
msgctl() routine is available.

"d_msgget"

From d_msgget.U:

This variable conditionally defines the "HAS_MSGGET"
symbol, which indicates to the C program that the
msgget() routine is available.

"d_msghdr_s"

From d_msghdr_s.U:

This variable conditionally defines the
"HAS_STRUCT_MSGHDR" symbol, which indicates that the
struct msghdr is supported.

"d_msgrcv"

From d_msgrcv.U:

This variable conditionally defines the "HAS_MSGRCV"
symbol, which indicates to the C program that the
msgrcv() routine is available.

"d_msgsnd"

From d_msgsnd.U:

This variable conditionally defines the "HAS_MSGSND"
symbol, which indicates to the C program that the
msgsnd() routine is available.

"d_msync"

From d_msync.U:

This variable conditionally defines "HAS_MSYNC" if
msync() is available to synchronize a mapped file.

"d_munmap"

From d_munmap.U:

This variable conditionally defines "HAS_MUNMAP" if
munmap() is available to unmap a region mapped by
mmap().

"d_mymalloc"

From mallocsrc.U:

This variable conditionally defines "MYMALLOC" in case
other parts of the source want to take special action
if "MYMALLOC" is used. This may include different
sorts of profiling or error detection.

"d_nice"

From d_nice.U:

This variable conditionally defines the "HAS_NICE"
symbol, which indicates to the C program that the
nice() routine is available.

"d_nl_langinfo"

From d_nl_langinfo.U:

This variable conditionally defines the "HAS_NL_LANG
INFO" symbol, which indicates to the C program that
the nl_langinfo() routine is available.

"d_nv_preserves_uv"

From perlxv.U:

This variable indicates whether a variable of type
nvtype can preserve all the bits a variable of type
uvtype.

"d_off64_t"

From d_off64_t.U:

This symbol will be defined if the C compiler supports
off64_t.

"d_old_pthread_create_joinable"

From d_pthrattrj.U:

This variable conditionally defines pthread_cre
ate_joinable. undef if pthread.h defines
"PTHREAD_CREATE_JOINABLE".

"d_oldpthreads"

From usethreads.U:

This variable conditionally defines the
"OLD_PTHREADS_API" symbol, and indicates that Perl
should be built to use the old draft "POSIX" threads
"API". This is only potentially meaningful if
usethreads is set.

"d_oldsock"

From d_socket.U:

This variable conditionally defines the "OLDSOCKET"
symbol, which indicates that the "BSD" socket inter
face is based on 4.1c and not 4.2.

"d_open3"

From d_open3.U:

This variable conditionally defines the HAS_OPEN3 man
ifest constant, which indicates to the C program that
the 3 argument version of the open(2) function is
available.

"d_pathconf"

From d_pathconf.U:

This variable conditionally defines the "HAS_PATHCONF"
symbol, which indicates to the C program that the
pathconf() routine is available to determine file-sys tem related limits and options associated with a given
filename.

"d_pause"

From d_pause.U:

This variable conditionally defines the "HAS_PAUSE"
symbol, which indicates to the C program that the
pause() routine is available to suspend a process
until a signal is received.

"d_perl_otherlibdirs"

From otherlibdirs.U:

This variable conditionally defines "PERL_OTHERLIB
DIRS", which contains a colon-separated set of paths
for the perl binary to include in @"INC". See also
otherlibdirs.

"d_phostname"

From d_gethname.U:

This variable conditionally defines the "HAS_PHOST
NAME" symbol, which contains the shell command which,
when fed to popen(), may be used to derive the host
name.

"d_pipe"

From d_pipe.U:

This variable conditionally defines the "HAS_PIPE"
symbol, which indicates to the C program that the
pipe() routine is available to create an inter-process channel.

"d_poll"

From d_poll.U:

This variable conditionally defines the "HAS_POLL"
symbol, which indicates to the C program that the
poll() routine is available to poll active file
descriptors.

"d_portable"

From d_portable.U:

This variable conditionally defines the "PORTABLE"
symbol, which indicates to the C program that it
should not assume that it is running on the machine it
was compiled on.

"d_PRId64"

From quadfio.U:

This variable conditionally defines the PERL_PRId64
symbol, which indiciates that stdio has a symbol to
print 64-bit decimal numbers.

"d_PRIeldbl"

From longdblfio.U:

This variable conditionally defines the PERL_PRIfldbl
symbol, which indiciates that stdio has a symbol to
print long doubles.

"d_PRIEUldbl"

From longdblfio.U:

This variable conditionally defines the PERL_PRIfldbl
symbol, which indiciates that stdio has a symbol to
print long doubles. The "U" in the name is to sepa
rate this from d_PRIeldbl so that even case-blind sys
tems can see the difference.

"d_PRIfldbl"

From longdblfio.U:

This variable conditionally defines the PERL_PRIfldbl
symbol, which indiciates that stdio has a symbol to
print long doubles.

"d_PRIFUldbl"

From longdblfio.U:

This variable conditionally defines the PERL_PRIfldbl
symbol, which indiciates that stdio has a symbol to
print long doubles. The "U" in the name is to sepa
rate this from d_PRIfldbl so that even case-blind sys
tems can see the difference.

"d_PRIgldbl"

From longdblfio.U:

This variable conditionally defines the PERL_PRIfldbl
symbol, which indiciates that stdio has a symbol to
print long doubles.

"d_PRIGUldbl"

From longdblfio.U:

This variable conditionally defines the PERL_PRIfldbl
symbol, which indiciates that stdio has a symbol to
print long doubles. The "U" in the name is to sepa
rate this from d_PRIgldbl so that even case-blind sys
tems can see the difference.

"d_PRIi64"

From quadfio.U:

This variable conditionally defines the PERL_PRIi64
symbol, which indiciates that stdio has a symbol to
print 64-bit decimal numbers.

"d_PRIo64"

From quadfio.U:

This variable conditionally defines the PERL_PRIo64
symbol, which indiciates that stdio has a symbol to
print 64-bit octal numbers.

"d_PRIu64"

From quadfio.U:

This variable conditionally defines the PERL_PRIu64
symbol, which indiciates that stdio has a symbol to
print 64-bit unsigned decimal numbers.

"d_PRIx64"

From quadfio.U:

This variable conditionally defines the PERL_PRIx64
symbol, which indiciates that stdio has a symbol to
print 64-bit hexadecimal numbers.

"d_PRIXU64"

From quadfio.U:

This variable conditionally defines the PERL_PRIXU64
symbol, which indiciates that stdio has a symbol to
print 64-bit hExADECimAl numbers. The "U" in the name
is to separate this from d_PRIx64 so that even caseblind systems can see the difference.

"d_procselfexe"

From d_procselfexe.U:

Defined if $procselfexe is symlink to the absolute
pathname of the executing program.

"d_pthread_atfork"

From d_pthread_atfork.U:

This variable conditionally defines the
"HAS_PTHREAD_ATFORK" symbol, which indicates to the C
program that the pthread_atfork() routine is avail able.

"d_pthread_yield"

From d_pthread_y.U:

This variable conditionally defines the
"HAS_PTHREAD_YIELD" symbol if the pthread_yield rou
tine is available to yield the execution of the cur
rent thread.

"d_pwage"

From i_pwd.U:

This variable conditionally defines "PWAGE", which
indicates that struct passwd contains pw_age.

"d_pwchange"

From i_pwd.U:

This variable conditionally defines "PWCHANGE", which
indicates that struct passwd contains pw_change.

"d_pwclass"

From i_pwd.U:

This variable conditionally defines "PWCLASS", which
indicates that struct passwd contains pw_class.

"d_pwcomment"

From i_pwd.U:

This variable conditionally defines "PWCOMMENT", which
indicates that struct passwd contains pw_comment.

"d_pwexpire"

From i_pwd.U:

This variable conditionally defines "PWEXPIRE", which
indicates that struct passwd contains pw_expire.

"d_pwgecos"

From i_pwd.U:

This variable conditionally defines "PWGECOS", which
indicates that struct passwd contains pw_gecos.

"d_pwpasswd"

From i_pwd.U:

This variable conditionally defines "PWPASSWD", which
indicates that struct passwd contains pw_passwd.

"d_pwquota"

From i_pwd.U:

This variable conditionally defines "PWQUOTA", which
indicates that struct passwd contains pw_quota.

"d_qgcvt"

From d_qgcvt.U:

This variable conditionally defines the "HAS_QGCVT"
symbol, which indicates to the C program that the
qgcvt() routine is available.

"d_quad"

From quadtype.U:

This variable, if defined, tells that there's a 64-bit
integer type, quadtype.

"d_random_r"

From d_random_r.U:

This variable conditionally defines the "HAS_RANDOM_R"
symbol, which indicates to the C program that the ran_
dom_r() routine is available.

"d_readdir64_r"

From d_readdir64_r.U:

This variable conditionally defines the HAS_READ
DIR64_R symbol, which indicates to the C program that
the readdir64_r() routine is available.

"d_readdir"

From d_readdir.U:

This variable conditionally defines "HAS_READDIR" if
readdir() is available to read directory entries.

"d_readdir_r"

From d_readdir_r.U:

This variable conditionally defines the "HAS_READ
DIR_R" symbol, which indicates to the C program that
the readdir_r() routine is available.

"d_readlink"

From d_readlink.U:

This variable conditionally defines the "HAS_READLINK"
symbol, which indicates to the C program that the
readlink() routine is available to read the value of a symbolic link.

"d_readv"

From d_readv.U:

This variable conditionally defines the "HAS_READV"
symbol, which indicates to the C program that the
readv() routine is available.

"d_recvmsg"

From d_recvmsg.U:

This variable conditionally defines the "HAS_RECVMSG"
symbol, which indicates to the C program that the
recvmsg() routine is available.

"d_rename"

From d_rename.U:

This variable conditionally defines the "HAS_RENAME"
symbol, which indicates to the C program that the
rename() routine is available to rename files.

"d_rewinddir"

From d_readdir.U:

This variable conditionally defines "HAS_REWINDDIR" if
rewinddir() is available.

"d_rmdir"

From d_rmdir.U:

This variable conditionally defines "HAS_RMDIR" if
rmdir() is available to remove directories.

"d_safebcpy"

From d_safebcpy.U:

This variable conditionally defines the
"HAS_SAFE_BCOPY" symbol if the bcopy() routine can do overlapping copies. Normally, you should probably use
memmove().

"d_safemcpy"

From d_safemcpy.U:

This variable conditionally defines the "HAS_SAFE_MEM
CPY" symbol if the memcpy() routine can do overlapping copies. For overlapping copies, memmove() should be used, if available.

"d_sanemcmp"

From d_sanemcmp.U:

This variable conditionally defines the "HAS_SANE_MEM
CMP" symbol if the memcpy() routine is available and can be used to compare relative magnitudes of chars
with their high bits set.

"d_sbrkproto"

From d_sbrkproto.U:

This variable conditionally defines the
"HAS_SBRK_PROTO" symbol, which indicates to the C pro
gram that the system provides a prototype for the
sbrk() function. Otherwise, it is up to the program
to supply one.

"d_sched_yield"

From d_pthread_y.U:

This variable conditionally defines the
"HAS_SCHED_YIELD" symbol if the sched_yield routine is
available to yield the execution of the current
thread.

"d_scm_rights"

From d_socket.U:

This variable conditionally defines the
"HAS_SCM_RIGHTS" symbol, which indicates that the
"SCM_RIGHTS" is available. #ifdef is not enough
because it may be an enum, glibc has been known to do
this.

"d_SCNfldbl"

From longdblfio.U:

This variable conditionally defines the PERL_PRIfldbl
symbol, which indiciates that stdio has a symbol to
scan long doubles.

"d_seekdir"

From d_readdir.U:

This variable conditionally defines "HAS_SEEKDIR" if
seekdir() is available.

"d_select"

From d_select.U:

This variable conditionally defines "HAS_SELECT" if
select() is available to select active file descrip tors. A <sys/time.h> inclusion may be necessary for
the timeout field.

"d_sem"

From d_sem.U:

This variable conditionally defines the "HAS_SEM" sym
bol, which indicates that the entire sem*(2) library
is present.

"d_semctl"

From d_semctl.U:

This variable conditionally defines the "HAS_SEMCTL"
symbol, which indicates to the C program that the sem_
ctl() routine is available.

"d_semctl_semid_ds"

From d_union_semun.U:

This variable conditionally defines "USE_SEM
CTL_SEMID_DS", which indicates that struct semid_ds *
is to be used for semctl "IPC_STAT".

"d_semctl_semun"

From d_union_semun.U:

This variable conditionally defines "USE_SEM
CTL_SEMUN", which indicates that union semun is to be
used for semctl "IPC_STAT".

"d_semget"

From d_semget.U:

This variable conditionally defines the "HAS_SEMGET"
symbol, which indicates to the C program that the
semget() routine is available.

"d_semop"

From d_semop.U:

This variable conditionally defines the "HAS_SEMOP"
symbol, which indicates to the C program that the
semop() routine is available.

"d_sendmsg"

From d_sendmsg.U:

This variable conditionally defines the "HAS_SENDMSG"
symbol, which indicates to the C program that the
sendmsg() routine is available.

"d_setegid"

From d_setegid.U:

This variable conditionally defines the "HAS_SETEGID"
symbol, which indicates to the C program that the
setegid() routine is available to change the effective gid of the current program.

"d_seteuid"

From d_seteuid.U:

This variable conditionally defines the "HAS_SETEUID"
symbol, which indicates to the C program that the
seteuid() routine is available to change the effective uid of the current program.

"d_setgrent"

From d_setgrent.U:

This variable conditionally defines the "HAS_SETGRENT"
symbol, which indicates to the C program that the set_
grent() routine is available for initializing sequen tial access to the group database.

"d_setgrent_r"

From d_setgrent_r.U:

This variable conditionally defines the "HAS_SET
GRENT_R" symbol, which indicates to the C program that
the setgrent_r() routine is available.

"d_setgrps"

From d_setgrps.U:

This variable conditionally defines the "HAS_SET
GROUPS" symbol, which indicates to the C program that
the setgroups() routine is available to set the list of process groups.

"d_sethent"

From d_sethent.U:

This variable conditionally defines "HAS_SETHOSTENT"
if sethostent() is available.

"d_sethostent_r"

From d_sethostent_r.U:

This variable conditionally defines the "HAS_SETHOS
TENT_R" symbol, which indicates to the C program that
the sethostent_r() routine is available.

"d_setitimer"

From d_setitimer.U:

This variable conditionally defines the
"HAS_SETITIMER" symbol, which indicates to the C pro
gram that the setitimer() routine is available.

"d_setlinebuf"

From d_setlnbuf.U:

This variable conditionally defines the "HAS_SET
LINEBUF" symbol, which indicates to the C program that
the setlinebuf() routine is available to change stderr or stdout from block-buffered or unbuffered to a linebuffered mode.

"d_setlocale"

From d_setlocale.U:

This variable conditionally defines "HAS_SETLOCALE" if
setlocale() is available to handle locale-specific ctype implementations.

"d_setlocale_r"

From d_setlocale_r.U:

This variable conditionally defines the "HAS_SETLO
CALE_R" symbol, which indicates to the C program that
the setlocale_r() routine is available.

"d_setnent"

From d_setnent.U:

This variable conditionally defines "HAS_SETNETENT" if
setnetent() is available.

"d_setnetent_r"

From d_setnetent_r.U:

This variable conditionally defines the "HAS_SETNE
TENT_R" symbol, which indicates to the C program that
the setnetent_r() routine is available.

"d_setpent"

From d_setpent.U:

This variable conditionally defines "HAS_SETPROTOENT"
if setprotoent() is available.

"d_setpgid"

From d_setpgid.U:

This variable conditionally defines the "HAS_SETPGID"
symbol if the setpgid(pid, gpid) function is available
to set process group "ID".

"d_setpgrp2"

From d_setpgrp2.U:

This variable conditionally defines the HAS_SETPGRP2
symbol, which indicates to the C program that the
setpgrp2() (as in DG/"UX") routine is available to set the current process group.

"d_setpgrp"

From d_setpgrp.U:

This variable conditionally defines "HAS_SETPGRP" if
setpgrp() is available to set the current process group.

"d_setprior"

From d_setprior.U:

This variable conditionally defines "HAS_SETPRIORITY"
if setpriority() is available to set a process's pri ority.

"d_setproctitle"

From d_setproctitle.U:

This variable conditionally defines the "HAS_SETPROC
TITLE" symbol, which indicates to the C program that
the setproctitle() routine is available.

"d_setprotoent_r"

From d_setprotoent_r.U:

This variable conditionally defines the "HAS_SETPRO
TOENT_R" symbol, which indicates to the C program that
the setprotoent_r() routine is available.

"d_setpwent"

From d_setpwent.U:

This variable conditionally defines the "HAS_SETPWENT"
symbol, which indicates to the C program that the set_
pwent() routine is available for initializing sequen tial access to the passwd database.

"d_setpwent_r"

From d_setpwent_r.U:

This variable conditionally defines the "HAS_SETP
WENT_R" symbol, which indicates to the C program that
the setpwent_r() routine is available.

"d_setregid"

From d_setregid.U:

This variable conditionally defines "HAS_SETREGID" if
setregid() is available to change the real and effec tive gid of the current process.

"d_setresgid"

From d_setregid.U:

This variable conditionally defines "HAS_SETRESGID" if
setresgid() is available to change the real, effective and saved gid of the current process.

"d_setresuid"

From d_setreuid.U:

This variable conditionally defines "HAS_SETREUID" if
setresuid() is available to change the real, effective and saved uid of the current process.

"d_setreuid"

From d_setreuid.U:

This variable conditionally defines "HAS_SETREUID" if
setreuid() is available to change the real and effec tive uid of the current process.

"d_setrgid"

From d_setrgid.U:

This variable conditionally defines the "HAS_SETRGID"
symbol, which indicates to the C program that the
setrgid() routine is available to change the real gid of the current program.

"d_setruid"

From d_setruid.U:

This variable conditionally defines the "HAS_SETRUID"
symbol, which indicates to the C program that the
setruid() routine is available to change the real uid of the current program.

"d_setsent"

From d_setsent.U:

This variable conditionally defines "HAS_SETSERVENT"
if setservent() is available.

"d_setservent_r"

From d_setservent_r.U:

This variable conditionally defines the "HAS_SETSER
VENT_R" symbol, which indicates to the C program that
the setservent_r() routine is available.

"d_setsid"

From d_setsid.U:

This variable conditionally defines "HAS_SETSID" if
setsid() is available to set the process group "ID".

"d_setvbuf"

From d_setvbuf.U:

This variable conditionally defines the "HAS_SETVBUF"
symbol, which indicates to the C program that the
setvbuf() routine is available to change buffering on an open stdio stream.

"d_sfio"

From d_sfio.U:

This variable conditionally defines the "USE_SFIO"
symbol, and indicates whether sfio is available (and
should be used).

"d_shm"

From d_shm.U:

This variable conditionally defines the "HAS_SHM" sym
bol, which indicates that the entire shm*(2) library
is present.

"d_shmat"

From d_shmat.U:

This variable conditionally defines the "HAS_SHMAT"
symbol, which indicates to the C program that the
shmat() routine is available.

"d_shmatprototype"

From d_shmat.U:

This variable conditionally defines the
"HAS_SHMAT_PROTOTYPE" symbol, which indicates that
sys/shm.h has a prototype for shmat.

"d_shmctl"

From d_shmctl.U:

This variable conditionally defines the "HAS_SHMCTL"
symbol, which indicates to the C program that the shm_
ctl() routine is available.

"d_shmdt"

From d_shmdt.U:

This variable conditionally defines the "HAS_SHMDT"
symbol, which indicates to the C program that the
shmdt() routine is available.

"d_shmget"

From d_shmget.U:

This variable conditionally defines the "HAS_SHMGET"
symbol, which indicates to the C program that the
shmget() routine is available.

"d_sigaction"

From d_sigaction.U:

This variable conditionally defines the "HAS_SIGAC
TION" symbol, which indicates that the Vr4 sigaction() routine is available.

"d_sigprocmask"

From d_sigprocmask.U:

This variable conditionally defines "HAS_SIGPROCMASK"
if sigprocmask() is available to examine or change the signal mask of the calling process.

"d_sigsetjmp"

From d_sigsetjmp.U:

This variable conditionally defines the
"HAS_SIGSETJMP" symbol, which indicates that the
sigsetjmp() routine is available to call setjmp() and optionally save the process's signal mask.

"d_sockatmark"

From d_sockatmark.U:

This variable conditionally defines the "HAS_SOCKAT
MARK" symbol, which indicates to the C program that
the sockatmark() routine is available.

"d_sockatmarkproto"

From d_sockatmarkproto.U:

This variable conditionally defines the "HAS_SOCKAT
MARK_PROTO" symbol, which indicates to the C program
that the system provides a prototype for the sockat_
mark() function. Otherwise, it is up to the program
to supply one.

"d_socket"

From d_socket.U:

This variable conditionally defines "HAS_SOCKET",
which indicates that the "BSD" socket interface is
supported.

"d_socklen_t"

From d_socklen_t.U:

This symbol will be defined if the C compiler supports
socklen_t.

"d_sockpair"

From d_socket.U:

This variable conditionally defines the "HAS_SOCKET
PAIR" symbol, which indicates that the "BSD" socket_
pair() is supported.

"d_socks5_init"

From d_socks5_init.U:

This variable conditionally defines the
HAS_SOCKS5_INIT symbol, which indicates to the C pro
gram that the socks5_init() routine is available.

"d_sqrtl"

From d_sqrtl.U:

This variable conditionally defines the "HAS_SQRTL"
symbol, which indicates to the C program that the
sqrtl() routine is available.

"d_srand48_r"

From d_srand48_r.U:

This variable conditionally defines the HAS_SRAND48_R
symbol, which indicates to the C program that the
srand48_r() routine is available.

"d_srandom_r"

From d_srandom_r.U:

This variable conditionally defines the "HAS_SRAN
DOM_R" symbol, which indicates to the C program that
the srandom_r() routine is available.

"d_sresgproto"

From d_sresgproto.U:

This variable conditionally defines the "HAS_SETRES
GID_PROTO" symbol, which indicates to the C program
that the system provides a prototype for the setres_
gid() function. Otherwise, it is up to the program to
supply one.

"d_sresuproto"

From d_sresuproto.U:

This variable conditionally defines the "HAS_SETRE
SUID_PROTO" symbol, which indicates to the C program
that the system provides a prototype for the setre_
suid() function. Otherwise, it is up to the program
to supply one.

"d_statblks"

From d_statblks.U:

This variable conditionally defines "USE_STAT_BLOCKS"
if this system has a stat structure declaring st_blk
size and st_blocks.

"d_statfs_f_flags"

From d_statfs_f_flags.U:

This variable conditionally defines the
"HAS_STRUCT_STATFS_F_FLAGS" symbol, which indicates to
struct statfs from has f_flags member. This kind of
struct statfs is coming from sys/mount.h ("BSD"), not from sys/statfs.h ("SYSV").

"d_statfs_s"

From d_statfs_s.U:

This variable conditionally defines the
"HAS_STRUCT_STATFS" symbol, which indicates that the
struct statfs is supported.

"d_statvfs"

From d_statvfs.U:

This variable conditionally defines the "HAS_STATVFS"
symbol, which indicates to the C program that the
statvfs() routine is available.

"d_stdio_cnt_lval"

From d_stdstdio.U:

This variable conditionally defines "STDIO_CNT_LVALUE"
if the "FILE_cnt" macro can be used as an lvalue.

"d_stdio_ptr_lval"

From d_stdstdio.U:

This variable conditionally defines "STDIO_PTR_LVALUE"
if the "FILE_ptr" macro can be used as an lvalue.

"d_stdio_ptr_lval_nochange_cnt"

From d_stdstdio.U:

This symbol is defined if using the "FILE_ptr" macro
as an lvalue to increase the pointer by n leaves
File_cnt(fp) unchanged.

"d_stdio_ptr_lval_sets_cnt"

From d_stdstdio.U:

This symbol is defined if using the "FILE_ptr" macro
as an lvalue to increase the pointer by n has the side
effect of decreasing the value of File_cnt(fp) by n.

"d_stdio_stream_array"

From stdio_streams.U:

This variable tells whether there is an array holding
the stdio streams.

"d_stdiobase"

From d_stdstdio.U:

This variable conditionally defines "USE_STDIO_BASE"
if this system has a "FILE" structure declaring a
usable _base field (or equivalent) in stdio.h.

"d_stdstdio"

From d_stdstdio.U:

This variable conditionally defines "USE_STDIO_PTR" if
this system has a "FILE" structure declaring usable
_ptr and _cnt fields (or equivalent) in stdio.h.

"d_strchr"

From d_strchr.U:

This variable conditionally defines "HAS_STRCHR" if
strchr() and strrchr() are available for string searching.

"d_strcoll"

From d_strcoll.U:

This variable conditionally defines "HAS_STRCOLL" if
strcoll() is available to compare strings using col lating information.

"d_strctcpy"

From d_strctcpy.U:

This variable conditionally defines the
"USE_STRUCT_COPY" symbol, which indicates to the C
program that this C compiler knows how to copy struc
tures.

"d_strerrm"

From d_strerror.U:

This variable holds what Strerrr is defined as to
translate an error code condition into an error mes
sage string. It could be "strerror" or a more "com
plex" macro emulating strrror with sys_errlist[], or
the "unknown" string when both strerror and
sys_errlist are missing.

"d_strerror"

From d_strerror.U:

This variable conditionally defines "HAS_STRERROR" if
strerror() is available to translate error numbers to strings.

"d_strerror_r"

From d_strerror_r.U:

This variable conditionally defines the "HAS_STR
ERROR_R" symbol, which indicates to the C program that
the strerror_r() routine is available.

"d_strftime"

From d_strftime.U:

This variable conditionally defines the "HAS_STRFTIME"
symbol, which indicates to the C program that the
strftime() routine is available.

"d_strtod"

From d_strtod.U:

This variable conditionally defines the "HAS_STRTOD"
symbol, which indicates to the C program that the str_
tod() routine is available to provide better numeric
string conversion than atof().

"d_strtol"

From d_strtol.U:

This variable conditionally defines the "HAS_STRTOL"
symbol, which indicates to the C program that the str_
tol() routine is available to provide better numeric
string conversion than atoi() and friends.

"d_strtold"

From d_strtold.U:

This variable conditionally defines the "HAS_STRTOLD"
symbol, which indicates to the C program that the str_
told() routine is available.

"d_strtoll"

From d_strtoll.U:

This variable conditionally defines the "HAS_STRTOLL"
symbol, which indicates to the C program that the str_
toll() routine is available.

"d_strtoq"

From d_strtoq.U:

This variable conditionally defines the "HAS_STRTOQ"
symbol, which indicates to the C program that the str_
toq() routine is available.

"d_strtoul"

From d_strtoul.U:

This variable conditionally defines the "HAS_STRTOUL"
symbol, which indicates to the C program that the str_
toul() routine is available to provide conversion of
strings to unsigned long.

"d_strtoull"

From d_strtoull.U:

This variable conditionally defines the "HAS_STRTOULL"
symbol, which indicates to the C program that the str_
toull() routine is available.

"d_strtouq"

From d_strtouq.U:

This variable conditionally defines the "HAS_STRTOUQ"
symbol, which indicates to the C program that the str_
touq() routine is available.

"d_strxfrm"

From d_strxfrm.U:

This variable conditionally defines "HAS_STRXFRM" if
strxfrm() is available to transform strings.

"d_suidsafe"

From d_dosuid.U:

This variable conditionally defines
"SETUID_SCRIPTS_ARE_SECURE_NOW" if setuid scripts can
be secure. This test looks in /dev/fd/.

"d_symlink"

From d_symlink.U:

This variable conditionally defines the "HAS_SYMLINK"
symbol, which indicates to the C program that the sym_
link() routine is available to create symbolic links.

"d_syscall"

From d_syscall.U:

This variable conditionally defines "HAS_SYSCALL" if
syscall() is available call arbitrary system calls.

"d_syscallproto"

From d_syscallproto.U:

This variable conditionally defines the
"HAS_SYSCALL_PROTO" symbol, which indicates to the C
program that the system provides a prototype for the
syscall() function. Otherwise, it is up to the pro gram to supply one.

"d_sysconf"

From d_sysconf.U:

This variable conditionally defines the "HAS_SYSCONF"
symbol, which indicates to the C program that the
sysconf() routine is available to determine system related limits and options.

"d_sysernlst"

From d_strerror.U:

This variable conditionally defines "HAS_SYS_ERRNO
LIST" if sys_errnolist[] is available to translate
error numbers to the symbolic name.

"d_syserrlst"

From d_strerror.U:

This variable conditionally defines "HAS_SYS_ERRLIST"
if sys_errlist[] is available to translate error num
bers to strings.

"d_system"

From d_system.U:

This variable conditionally defines "HAS_SYSTEM" if
system() is available to issue a shell command.

"d_tcgetpgrp"

From d_tcgtpgrp.U:

This variable conditionally defines the "HAS_TCGETP
GRP" symbol, which indicates to the C program that the
tcgetpgrp() routine is available. to get foreground process group "ID".

"d_tcsetpgrp"

From d_tcstpgrp.U:

This variable conditionally defines the "HAS_TCSETP
GRP" symbol, which indicates to the C program that the
tcsetpgrp() routine is available to set foreground process group "ID".

"d_telldir"

From d_readdir.U:

This variable conditionally defines "HAS_TELLDIR" if
telldir() is available.

"d_telldirproto"

From d_telldirproto.U:

This variable conditionally defines the
"HAS_TELLDIR_PROTO" symbol, which indicates to the C
program that the system provides a prototype for the
telldir() function. Otherwise, it is up to the pro gram to supply one.

"d_time"

From d_time.U:

This variable conditionally defines the "HAS_TIME"
symbol, which indicates that the time() routine
exists. The time() routine is normaly provided on
"UNIX" systems.

"d_times"

From d_times.U:

This variable conditionally defines the "HAS_TIMES"
symbol, which indicates that the times() routine
exists. The times() routine is normaly provided on
"UNIX" systems. You may have to include <sys/times.h>.

"d_tm_tm_gmtoff"

From i_time.U:

This variable conditionally defines
"HAS_TM_TM_GMTOFF", which indicates indicates to the C
program that the struct tm has the tm_gmtoff field.

"d_tm_tm_zone"

From i_time.U:

This variable conditionally defines "HAS_TM_TM_ZONE",
which indicates indicates to the C program that the
struct tm has the tm_zone field.

"d_tmpnam_r"

From d_tmpnam_r.U:

This variable conditionally defines the "HAS_TMPNAM_R"
symbol, which indicates to the C program that the tmp_
nam_r() routine is available.

"d_truncate"

From d_truncate.U:

This variable conditionally defines "HAS_TRUNCATE" if
truncate() is available to truncate files.

"d_ttyname_r"

From d_ttyname_r.U:

This variable conditionally defines the "HAS_TTY
NAME_R" symbol, which indicates to the C program that
the ttyname_r() routine is available.

"d_tzname"

From d_tzname.U:

This variable conditionally defines "HAS_TZNAME" if
tzname[] is available to access timezone names.

"d_u32align"

From d_u32align.U:

This variable tells whether you must access character
data through U32-aligned pointers.

"d_ualarm"

From d_ualarm.U:

This variable conditionally defines the "HAS_UALARM"
symbol, which indicates to the C program that the
ualarm() routine is available.

"d_umask"

From d_umask.U:

This variable conditionally defines the "HAS_UMASK"
symbol, which indicates to the C program that the
umask() routine is available. to set and get the
value of the file creation mask.

"d_uname"

From d_gethname.U:

This variable conditionally defines the "HAS_UNAME"
symbol, which indicates to the C program that the
uname() routine may be used to derive the host name.

"d_union_semun"

From d_union_semun.U:

This variable conditionally defines "HAS_UNION_SEMUN"
if the union semun is defined by including
<sys/sem.h>.

"d_unordered"

From d_unordered.U:

This variable conditionally defines the
"HAS_UNORDERED" symbol, which indicates to the C pro
gram that the unordered() routine is available.

"d_usleep"

From d_usleep.U:

This variable conditionally defines "HAS_USLEEP" if
usleep() is available to do high granularity sleeps.

"d_usleepproto"

From d_usleepproto.U:

This variable conditionally defines the
"HAS_USLEEP_PROTO" symbol, which indicates to the C
program that the system provides a prototype for the
usleep() function. Otherwise, it is up to the program to supply one.

"d_ustat"

From d_ustat.U:

This variable conditionally defines "HAS_USTAT" if
ustat() is available to query file system statistics by dev_t.

"d_vendorarch"

From vendorarch.U:

This variable conditionally defined "PERL_VENDORARCH".

"d_vendorbin"

From vendorbin.U:

This variable conditionally defines "PERL_VENDORBIN".

"d_vendorlib"

From vendorlib.U:

This variable conditionally defines "PERL_VENDORLIB".

"d_vfork"

From d_vfork.U:

This variable conditionally defines the "HAS_VFORK"
symbol, which indicates the vfork() routine is avail able.

"d_void_closedir"

From d_closedir.U:

This variable conditionally defines "VOID_CLOSEDIR" if
closedir() does not return a value.

"d_voidsig"

From d_voidsig.U:

This variable conditionally defines "VOIDSIG" if this
system declares "void (*signal(...))()" in signal.h. The old way was to declare it as "int (*sig
nal(...))()".

"d_voidtty"

From i_sysioctl.U:

This variable conditionally defines "USE_IOCNOTTY" to
indicate that the ioctl() call with "TIOCNOTTY" should be used to void tty association. Otherwise (on "USG"
probably), it is enough to close the standard file
decriptors and do a setpgrp().

"d_volatile"

From d_volatile.U:

This variable conditionally defines the "HASVOLATILE"
symbol, which indicates to the C program that this C
compiler knows about the volatile declaration.

"d_vprintf"

From d_vprintf.U:

This variable conditionally defines the "HAS_VPRINTF"
symbol, which indicates to the C program that the
vprintf() routine is available to printf with a
pointer to an argument list.

"d_wait4"

From d_wait4.U:

This variable conditionally defines the HAS_WAIT4 sym
bol, which indicates the wait4() routine is available.

"d_waitpid"

From d_waitpid.U:

This variable conditionally defines "HAS_WAITPID" if
waitpid() is available to wait for child process.

"d_wcstombs"

From d_wcstombs.U:

This variable conditionally defines the "HAS_WCSTOMBS"
symbol, which indicates to the C program that the
wcstombs() routine is available to convert wide char acter strings to multibyte strings.

"d_wctomb"

From d_wctomb.U:

This variable conditionally defines the "HAS_WCTOMB"
symbol, which indicates to the C program that the
wctomb() routine is available to convert a wide char acter to a multibyte.

"d_writev"

From d_writev.U:

This variable conditionally defines the "HAS_WRITEV"
symbol, which indicates to the C program that the
writev() routine is available.

"d_xenix"

From Guess.U:

This variable conditionally defines the symbol
"XENIX", which alerts the C program that it runs under
Xenix.

"date"

From Loc.U:

This variable is used internally by Configure to
determine the full pathname (if any) of the date pro
gram. After Configure runs, the value is reset to a
plain "date" and is not useful.

"db_hashtype"

From i_db.U:

This variable contains the type of the hash structure
element in the <db.h> header file. In older versions
of "DB", it was int, while in newer ones it is
u_int32_t.

"db_prefixtype"

From i_db.U:

This variable contains the type of the prefix struc
ture element in the <db.h> header file. In older ver
sions of "DB", it was int, while in newer ones it is
size_t.

"db_version_major"

From i_db.U:

This variable contains the major version number of
Berkeley "DB" found in the <db.h> header file.

"db_version_minor"

From i_db.U:

This variable contains the minor version number of
Berkeley "DB" found in the <db.h> header file. For
"DB" version 1 this is always 0.

"db_version_patch"

From i_db.U:

This variable contains the patch version number of
Berkeley "DB" found in the <db.h> header file. For
"DB" version 1 this is always 0.

"defvoidused"

From voidflags.U:

This variable contains the default value of the
"VOIDUSED" symbol (15).

"direntrytype"

From i_dirent.U:

This symbol is set to "struct direct" or "struct
dirent" depending on whether dirent is available or
not. You should use this pseudo type to portably
declare your directory entries.

"dlext"

From dlext.U:

This variable contains the extension that is to be
used for the dynamically loaded modules that perl gen
eraties.

"dlsrc"

From dlsrc.U:

This variable contains the name of the dynamic loading
file that will be used with the package.

"doublesize"

From doublesize.U:

This variable contains the value of the "DOUBLESIZE"
symbol, which indicates to the C program how many
bytes there are in a double.

"drand01"

From randfunc.U:

Indicates the macro to be used to generate normalized
random numbers. Uses randfunc, often divided by (dou
ble) (((unsigned long) 1 << randbits)) in order to
normalize the result. In C programs, the macro
"Drand01" is mapped to drand01.

"drand48_r_proto"

From d_drand48_r.U:

This variable encodes the prototype of drand48_r. It
is zero if d_drand48_r is undef, and one of the "REEN
TRANT_PROTO_T_ABC" macros of reentr.h if d_drand48_r is defined.

"dynamic_ext"

From Extensions.U:

This variable holds a list of "XS" extension files we
want to link dynamically into the package. It is used
by Makefile.

e

"eagain"

From nblock_io.U:

This variable bears the symbolic errno code set by
read() when no data is present on the file and nonblocking I/O was enabled (otherwise, read() blocks
naturally).

"ebcdic"

From ebcdic.U:

This variable conditionally defines "EBCDIC" if this
system uses "EBCDIC" encoding. Among other things,
this means that the character ranges are not contigu
ous. See trnl.U

"echo"

From Loc.U:

This variable is used internally by Configure to
determine the full pathname (if any) of the echo pro
gram. After Configure runs, the value is reset to a
plain "echo" and is not useful.

"egrep"

From Loc.U:

This variable is used internally by Configure to
determine the full pathname (if any) of the egrep pro
gram. After Configure runs, the value is reset to a
plain "egrep" and is not useful.

"emacs"

From Loc.U:

This variable is defined but not used by Configure.
The value is a plain '' and is not useful.

"endgrent_r_proto"

From d_endgrent_r.U:

This variable encodes the prototype of endgrent_r. It
is zero if d_endgrent_r is undef, and one of the
"REENTRANT_PROTO_T_ABC" macros of reentr.h if d_end grent_r is defined.

"endhostent_r_proto"

From d_endhostent_r.U:

This variable encodes the prototype of endhostent_r.
It is zero if d_endhostent_r is undef, and one of the
"REENTRANT_PROTO_T_ABC" macros of reentr.h if d_end hostent_r is defined.

"endnetent_r_proto"

From d_endnetent_r.U:

This variable encodes the prototype of endnetent_r.
It is zero if d_endnetent_r is undef, and one of the
"REENTRANT_PROTO_T_ABC" macros of reentr.h if d_endne tent_r is defined.

"endprotoent_r_proto"

From d_endprotoent_r.U:

This variable encodes the prototype of endprotoent_r.
It is zero if d_endprotoent_r is undef, and one of the
"REENTRANT_PROTO_T_ABC" macros of reentr.h if d_end protoent_r is defined.

"endpwent_r_proto"

From d_endpwent_r.U:

This variable encodes the prototype of endpwent_r. It
is zero if d_endpwent_r is undef, and one of the
"REENTRANT_PROTO_T_ABC" macros of reentr.h if d_endp went_r is defined.

"endservent_r_proto"

From d_endservent_r.U:

This variable encodes the prototype of endservent_r.
It is zero if d_endservent_r is undef, and one of the
"REENTRANT_PROTO_T_ABC" macros of reentr.h if d_end servent_r is defined.

"eunicefix"

From Init.U:

When running under Eunice this variable contains a
command which will convert a shell script to the
proper form of text file for it to be executable by
the shell. On other systems it is a no-op.

"exe_ext"

From Unix.U:

This is an old synonym for _exe.

"expr"

From Loc.U:

This variable is used internally by Configure to
determine the full pathname (if any) of the expr pro
gram. After Configure runs, the value is reset to a
plain "expr" and is not useful.

"extensions"

From Extensions.U:

This variable holds a list of all extension files
(both "XS" and non-xs linked into the package. It is
propagated to Config.pm and is typically used to test whether a particular extesion is available.

"extras"

From Extras.U:

This variable holds a list of extra modules to
install.

f

"fflushall"

From fflushall.U:

This symbol, if defined, tells that to flush all
pending stdio output one must loop through all the
stdio file handles stored in an array and fflush them.
Note that if fflushNULL is defined, fflushall will not
even be probed for and will be left undefined.

"fflushNULL"

From fflushall.U:

This symbol, if defined, tells that fflush("NULL")
does flush all pending stdio output.

"find"

From Loc.U:

This variable is defined but not used by Configure.
The value is a plain '' and is not useful.

"firstmakefile"

From Unix.U:

This variable defines the first file searched by make.
On unix, it is makefile (then Makefile). On caseinsensitive systems, it might be something else. This
is only used to deal with convoluted make depend
tricks.

"flex"

From Loc.U:

This variable is defined but not used by Configure.
The value is a plain '' and is not useful.

"fpossize"

From fpossize.U:

This variable contains the size of a fpostype in
bytes.

"fpostype"

From fpostype.U:

This variable defines Fpos_t to be something like
fpos_t, long, uint, or whatever type is used to
declare file positions in libc.

"freetype"

From mallocsrc.U:

This variable contains the return type of free(). It
is usually void, but occasionally int.

"from"

From Cross.U:

This variable contains the command used by Configure
to copy files from the target host. Useful and avail
able only during Perl build. The string ":" if not
cross-compiling.

"full_ar"

From Loc_ar.U:

This variable contains the full pathname to "ar",
whether or not the user has specified "portability".
This is only used in the Makefile.SH.

"full_csh"

From d_csh.U:

This variable contains the full pathname to "csh",
whether or not the user has specified "portability".
This is only used in the compiled C program, and we
assume that all systems which can share this exe
cutable will have the same full pathname to csh.

"full_sed"

From Loc_sed.U:

This variable contains the full pathname to "sed",
whether or not the user has specified "portability".
This is only used in the compiled C program, and we
assume that all systems which can share this exe
cutable will have the same full pathname to sed.

g

"gccosandvers"

From gccvers.U:

If "GNU" cc (gcc) is used, this variable the operating
system and version used to compile the gcc. It is set
to '' if not gcc, or if nothing useful can be parsed
as the os version.

"gccversion"

From gccvers.U:

If "GNU" cc (gcc) is used, this variable holds 1 or 2
to indicate whether the compiler is version 1 or 2.
This is used in setting some of the default cflags.
It is set to '' if not gcc.

"getgrent_r_proto"

From d_getgrent_r.U:

This variable encodes the prototype of getgrent_r. It
is zero if d_getgrent_r is undef, and one of the
"REENTRANT_PROTO_T_ABC" macros of reentr.h if d_get grent_r is defined.

"getgrgid_r_proto"

From d_getgrgid_r.U:

This variable encodes the prototype of getgrgid_r. It
is zero if d_getgrgid_r is undef, and one of the
"REENTRANT_PROTO_T_ABC" macros of reentr.h if d_get grgid_r is defined.

"getgrnam_r_proto"

From d_getgrnam_r.U:

This variable encodes the prototype of getgrnam_r. It
is zero if d_getgrnam_r is undef, and one of the
"REENTRANT_PROTO_T_ABC" macros of reentr.h if d_getgr nam_r is defined.

"gethostbyaddr_r_proto"

From d_gethostbyaddr_r.U:

This variable encodes the prototype of gethost
byaddr_r. It is zero if d_gethostbyaddr_r is undef,
and one of the "REENTRANT_PROTO_T_ABC" macros of
reentr.h if d_gethostbyaddr_r is defined.

"gethostbyname_r_proto"

From d_gethostbyname_r.U:

This variable encodes the prototype of gethostby
name_r. It is zero if d_gethostbyname_r is undef, and
one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_gethostbyname_r is defined.

"gethostent_r_proto"

From d_gethostent_r.U:

This variable encodes the prototype of gethostent_r.
It is zero if d_gethostent_r is undef, and one of the
"REENTRANT_PROTO_T_ABC" macros of reentr.h if d_geth ostent_r is defined.

"getlogin_r_proto"

From d_getlogin_r.U:

This variable encodes the prototype of getlogin_r. It
is zero if d_getlogin_r is undef, and one of the
"REENTRANT_PROTO_T_ABC" macros of reentr.h if d_getlo gin_r is defined.

"getnetbyaddr_r_proto"

From d_getnetbyaddr_r.U:

This variable encodes the prototype of getnetbyaddr_r.
It is zero if d_getnetbyaddr_r is undef, and one of
the "REENTRANT_PROTO_T_ABC" macros of reentr.h if
d_getnetbyaddr_r is defined.

"getnetbyname_r_proto"

From d_getnetbyname_r.U:

This variable encodes the prototype of getnetbyname_r.
It is zero if d_getnetbyname_r is undef, and one of
the "REENTRANT_PROTO_T_ABC" macros of reentr.h if
d_getnetbyname_r is defined.

"getnetent_r_proto"

From d_getnetent_r.U:

This variable encodes the prototype of getnetent_r.
It is zero if d_getnetent_r is undef, and one of the
"REENTRANT_PROTO_T_ABC" macros of reentr.h if d_getne tent_r is defined.

"getprotobyname_r_proto"

From d_getprotobyname_r.U:

This variable encodes the prototype of getprotoby
name_r. It is zero if d_getprotobyname_r is undef,
and one of the "REENTRANT_PROTO_T_ABC" macros of
reentr.h if d_getprotobyname_r is defined.

"getprotobynumber_r_proto"

From d_getprotobynumber_r.U:

This variable encodes the prototype of getprotobynum
ber_r. It is zero if d_getprotobynumber_r is undef,
and one of the "REENTRANT_PROTO_T_ABC" macros of
reentr.h if d_getprotobynumber_r is defined.

"getprotoent_r_proto"

From d_getprotoent_r.U:

This variable encodes the prototype of getprotoent_r.
It is zero if d_getprotoent_r is undef, and one of the
"REENTRANT_PROTO_T_ABC" macros of reentr.h if d_get protoent_r is defined.

"getpwent_r_proto"

From d_getpwent_r.U:

This variable encodes the prototype of getpwent_r. It
is zero if d_getpwent_r is undef, and one of the
"REENTRANT_PROTO_T_ABC" macros of reentr.h if d_getp went_r is defined.

"getpwnam_r_proto"

From d_getpwnam_r.U:

This variable encodes the prototype of getpwnam_r. It
is zero if d_getpwnam_r is undef, and one of the
"REENTRANT_PROTO_T_ABC" macros of reentr.h if d_getpw nam_r is defined.

"getpwuid_r_proto"

From d_getpwuid_r.U:

This variable encodes the prototype of getpwuid_r. It
is zero if d_getpwuid_r is undef, and one of the
"REENTRANT_PROTO_T_ABC" macros of reentr.h if d_getp wuid_r is defined.

"getservbyname_r_proto"

From d_getservbyname_r.U:

This variable encodes the prototype of getservby
name_r. It is zero if d_getservbyname_r is undef, and
one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_getservbyname_r is defined.

"getservbyport_r_proto"

From d_getservbyport_r.U:

This variable encodes the prototype of getservby
port_r. It is zero if d_getservbyport_r is undef, and
one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_getservbyport_r is defined.

"getservent_r_proto"

From d_getservent_r.U:

This variable encodes the prototype of getservent_r.
It is zero if d_getservent_r is undef, and one of the
"REENTRANT_PROTO_T_ABC" macros of reentr.h if d_get servent_r is defined.

"getspnam_r_proto"

From d_getspnam_r.U:

This variable encodes the prototype of getspnam_r. It
is zero if d_getspnam_r is undef, and one of the
"REENTRANT_PROTO_T_ABC" macros of reentr.h if d_getsp nam_r is defined.

"gidformat"

From gidf.U:

This variable contains the format string used for
printing a Gid_t.

"gidsign"

From gidsign.U:

This variable contains the signedness of a gidtype. 1
for unsigned, -1 for signed.

"gidsize"

From gidsize.U:

This variable contains the size of a gidtype in bytes.

"gidtype"

From gidtype.U:

This variable defines Gid_t to be something like
gid_t, int, ushort, or whatever type is used to
declare the return type of getgid(). Typically, it is the type of group ids in the kernel.

"glibpth"

From libpth.U:

This variable holds the general path (space-separated)
used to find libraries. It may contain directories
that do not exist on this platform, libpth is the
cleaned-up version.

"gmake"

From Loc.U:

This variable is used internally by Configure to
determine the full pathname (if any) of the gmake pro
gram. After Configure runs, the value is reset to a
plain "gmake" and is not useful.

"gmtime_r_proto"

From d_gmtime_r.U:

This variable encodes the prototype of gmtime_r. It
is zero if d_gmtime_r is undef, and one of the "REEN
TRANT_PROTO_T_ABC" macros of reentr.h if d_gmtime_r is defined.

"gnulibc_version"

From d_gnulibc.U:

This variable contains the version number of the "GNU"
C library. It is usually something like 2.2.5. It is
a plain '' if this is not the "GNU" C library, or if
the version is unknown.

"grep"

From Loc.U:

This variable is used internally by Configure to
determine the full pathname (if any) of the grep pro
gram. After Configure runs, the value is reset to a
plain "grep" and is not useful.

"groupcat"

From nis.U:

This variable contains a command that produces the
text of the /etc/group file. This is normally "cat /etc/group", but can be "ypcat group" when "NIS" is used. On some systems, such as os390, there may be no
equivalent command, in which case this variable is
unset.

"groupstype"

From groupstype.U:

This variable defines Groups_t to be something like
gid_t, int, ushort, or whatever type is used for the
second argument to getgroups() and setgroups(). Usu ally, this is the same as gidtype (gid_t), but some
times it isn't.

"gzip"

From Loc.U:

This variable is used internally by Configure to
determine the full pathname (if any) of the gzip pro
gram. After Configure runs, the value is reset to a
plain "gzip" and is not useful.

h

"h_fcntl"

From h_fcntl.U:

This is variable gets set in various places to tell
i_fcntl that <fcntl.h> should be included.

"h_sysfile"

From h_sysfile.U:

This is variable gets set in various places to tell
i_sys_file that <sys/file.h> should be included.

"hint"

From Oldconfig.U:

Gives the type of hints used for previous answers. May
be one of "default", "recommended" or "previous".

"hostcat"

From nis.U:

This variable contains a command that produces the
text of the /etc/hosts file. This is normally "cat /etc/hosts", but can be "ypcat hosts" when "NIS" is used. On some systems, such as os390, there may be no
equivalent command, in which case this variable is
unset.

i

"i16size"

From perlxv.U:

This variable is the size of an I16 in bytes.

"i16type"

From perlxv.U:

This variable contains the C type used for Perl's I16.

"i32size"

From perlxv.U:

This variable is the size of an I32 in bytes.

"i32type"

From perlxv.U:

This variable contains the C type used for Perl's I32.

"i64size"

From perlxv.U:

This variable is the size of an I64 in bytes.

"i64type"

From perlxv.U:

This variable contains the C type used for Perl's I64.

"i8size"

From perlxv.U:

This variable is the size of an I8 in bytes.

"i8type"

From perlxv.U:

This variable contains the C type used for Perl's I8.

"i_arpainet"

From i_arpainet.U:

This variable conditionally defines the "I_ARPA_INET"
symbol, and indicates whether a C program should
include <arpa/inet.h>.

"i_bsdioctl"

From i_sysioctl.U:

This variable conditionally defines the
"I_SYS_BSDIOCTL" symbol, which indicates to the C pro
gram that <sys/bsdioctl.h> exists and should be
included.

"i_crypt"

From i_crypt.U:

This variable conditionally defines the "I_CRYPT" sym
bol, and indicates whether a C program should include
<crypt.h>.

"i_db"

From i_db.U:

This variable conditionally defines the "I_DB" symbol,
and indicates whether a C program may include Berke
ley's "DB" include file <db.h>.

"i_dbm"

From i_dbm.U:

This variable conditionally defines the "I_DBM"
symbol, which indicates to the C program that <dbm.h>
exists and should be included.

"i_dirent"

From i_dirent.U:

This variable conditionally defines "I_DIRENT", which
indicates to the C program that it should include
<dirent.h>.

"i_dld"

From i_dld.U:

This variable conditionally defines the "I_DLD" sym
bol, which indicates to the C program that <dld.h>
("GNU" dynamic loading) exists and should be included.

"i_dlfcn"

From i_dlfcn.U:

This variable conditionally defines the "I_DLFCN" sym
bol, which indicates to the C program that <dlfcn.h>
exists and should be included.

"i_fcntl"

From i_fcntl.U:

This variable controls the value of "I_FCNTL" (which
tells the C program to include <fcntl.h>).

"i_float"

From i_float.U:

This variable conditionally defines the "I_FLOAT" sym
bol, and indicates whether a C program may include
<float.h> to get symbols like "DBL_MAX" or "DBL_MIN",
i.e. machine dependent floating point values.

"i_fp"

From i_fp.U:

This variable conditionally defines the "I_FP" symbol,
and indicates whether a C program should include
<fp.h>.

"i_fp_class"

From i_fp_class.U:

This variable conditionally defines the "I_FP_CLASS"
symbol, and indicates whether a C program should
include <fp_class.h>.

"i_gdbm"

From i_gdbm.U:

This variable conditionally defines the "I_GDBM" sym
bol, which indicates to the C program that <gdbm.h>
exists and should be included.

"i_grp"

From i_grp.U:

This variable conditionally defines the "I_GRP" sym
bol, and indicates whether a C program should include
<grp.h>.

"i_ieeefp"

From i_ieeefp.U:

This variable conditionally defines the "I_IEEEFP"
symbol, and indicates whether a C program should
include <ieeefp.h>.

"i_inttypes"

From i_inttypes.U:

This variable conditionally defines the "I_INTTYPES"
symbol, and indicates whether a C program should
include <inttypes.h>.

"i_langinfo"

From i_langinfo.U:

This variable conditionally defines the "I_LANGINFO"
symbol, and indicates whether a C program should
include <langinfo.h>.

"i_libutil"

From i_libutil.U:

This variable conditionally defines the "I_LIBUTIL"
symbol, and indicates whether a C program should
include <libutil.h>.

"i_limits"

From i_limits.U:

This variable conditionally defines the "I_LIMITS"
symbol, and indicates whether a C program may include
<limits.h> to get symbols like "WORD_BIT" and friends.

"i_locale"

From i_locale.U:

This variable conditionally defines the "I_LOCALE"
symbol, and indicates whether a C program should
include <locale.h>.

"i_machcthr"

From i_machcthr.U:

This variable conditionally defines the
"I_MACH_CTHREADS" symbol, and indicates whether a C
program should include <mach/cthreads.h>.

"i_malloc"

From i_malloc.U:

This variable conditionally defines the "I_MALLOC"
symbol, and indicates whether a C program should
include <malloc.h>.

"i_math"

From i_math.U:

This variable conditionally defines the "I_MATH" sym
bol, and indicates whether a C program may include
<math.h>.

"i_memory"

From i_memory.U:

This variable conditionally defines the "I_MEMORY"
symbol, and indicates whether a C program should
include <memory.h>.

"i_mntent"

From i_mntent.U:

This variable conditionally defines the "I_MNTENT"
symbol, and indicates whether a C program should
include <mntent.h>.

"i_ndbm"

From i_ndbm.U:

This variable conditionally defines the "I_NDBM" sym
bol, which indicates to the C program that <ndbm.h>
exists and should be included.

"i_netdb"

From i_netdb.U:

This variable conditionally defines the "I_NETDB" sym
bol, and indicates whether a C program should include
<netdb.h>.

"i_neterrno"

From i_neterrno.U:

This variable conditionally defines the "I_NET_ERRNO"
symbol, which indicates to the C program that
<net/errno.h> exists and should be included.

"i_netinettcp"

From i_netinettcp.U:

This variable conditionally defines the
"I_NETINET_TCP" symbol, and indicates whether a C pro
gram should include <netinet/tcp.h>.

"i_niin"

From i_niin.U:

This variable conditionally defines "I_NETINET_IN",
which indicates to the C program that it should
include <netinet/in.h>. Otherwise, you may try
<sys/in.h>.

"i_poll"

From i_poll.U:

This variable conditionally defines the "I_POLL" sym
bol, and indicates whether a C program should include
<poll.h>.

"i_prot"

From i_prot.U:

This variable conditionally defines the "I_PROT" sym
bol, and indicates whether a C program should include
<prot.h>.

"i_pthread"

From i_pthread.U:

This variable conditionally defines the "I_PTHREAD"
symbol, and indicates whether a C program should
include <pthread.h>.

"i_pwd"

From i_pwd.U:

This variable conditionally defines "I_PWD", which
indicates to the C program that it should include
<pwd.h>.

"i_rpcsvcdbm"

From i_dbm.U:

This variable conditionally defines the "I_RPCSVC_DBM"
symbol, which indicates to the C program that
<rpcsvc/dbm.h> exists and should be included. Some
System V systems might need this instead of <dbm.h>.

"i_sfio"

From i_sfio.U:

This variable conditionally defines the "I_SFIO" sym
bol, and indicates whether a C program should include
<sfio.h>.

"i_sgtty"

From i_termio.U:

This variable conditionally defines the "I_SGTTY" sym
bol, which indicates to the C program that it should
include <sgtty.h> rather than <termio.h>.

"i_shadow"

From i_shadow.U:

This variable conditionally defines the "I_SHADOW"
symbol, and indicates whether a C program should
include <shadow.h>.

"i_socks"

From i_socks.U:

This variable conditionally defines the "I_SOCKS" sym
bol, and indicates whether a C program should include
<socks.h>.

"i_stdarg"

From i_varhdr.U:

This variable conditionally defines the "I_STDARG"
symbol, which indicates to the C program that
<stdarg.h> exists and should be included.

"i_stddef"

From i_stddef.U:

This variable conditionally defines the "I_STDDEF"
symbol, which indicates to the C program that <std
def.h> exists and should be included.

"i_stdlib"

From i_stdlib.U:

This variable conditionally defines the "I_STDLIB"
symbol, which indicates to the C program that
<stdlib.h> exists and should be included.

"i_string"

From i_string.U:

This variable conditionally defines the "I_STRING"
symbol, which indicates that <string.h> should be
included rather than <strings.h>.

"i_sunmath"

From i_sunmath.U:

This variable conditionally defines the "I_SUNMATH"
symbol, and indicates whether a C program should
include <sunmath.h>.

"i_sysaccess"

From i_sysaccess.U:

This variable conditionally defines the "I_SYS_ACCESS"
symbol, and indicates whether a C program should
include <sys/access.h>.

"i_sysdir"

From i_sysdir.U:

This variable conditionally defines the "I_SYS_DIR"
symbol, and indicates whether a C program should
include <sys/dir.h>.

"i_sysfile"

From i_sysfile.U:

This variable conditionally defines the "I_SYS_FILE"
symbol, and indicates whether a C program should
include <sys/file.h> to get "R_OK" and friends.

"i_sysfilio"

From i_sysioctl.U:

This variable conditionally defines the "I_SYS_FILIO"
symbol, which indicates to the C program that
<sys/filio.h> exists and should be included in prefer
ence to <sys/ioctl.h>.

"i_sysin"

From i_niin.U:

This variable conditionally defines "I_SYS_IN", which
indicates to the C program that it should include
<sys/in.h> instead of <netinet/in.h>.

"i_sysioctl"

From i_sysioctl.U:

This variable conditionally defines the "I_SYS_IOCTL"
symbol, which indicates to the C program that
<sys/ioctl.h> exists and should be included.

"i_syslog"

From i_syslog.U:

This variable conditionally defines the "I_SYSLOG"
symbol, and indicates whether a C program should
include <syslog.h>.

"i_sysmman"

From i_sysmman.U:

This variable conditionally defines the "I_SYS_MMAN"
symbol, and indicates whether a C program should
include <sys/mman.h>.

"i_sysmode"

From i_sysmode.U:

This variable conditionally defines the "I_SYSMODE"
symbol, and indicates whether a C program should
include <sys/mode.h>.

"i_sysmount"

From i_sysmount.U:

This variable conditionally defines the "I_SYSMOUNT"
symbol, and indicates whether a C program should
include <sys/mount.h>.

"i_sysndir"

From i_sysndir.U:

This variable conditionally defines the "I_SYS_NDIR"
symbol, and indicates whether a C program should
include <sys/ndir.h>.

"i_sysparam"

From i_sysparam.U:

This variable conditionally defines the "I_SYS_PARAM"
symbol, and indicates whether a C program should
include <sys/param.h>.

"i_sysresrc"

From i_sysresrc.U:

This variable conditionally defines the
"I_SYS_RESOURCE" symbol, and indicates whether a C
program should include <sys/resource.h>.

"i_syssecrt"

From i_syssecrt.U:

This variable conditionally defines the "I_SYS_SECU
RITY" symbol, and indicates whether a C program should
include <sys/security.h>.

"i_sysselct"

From i_sysselct.U:

This variable conditionally defines "I_SYS_SELECT",
which indicates to the C program that it should
include <sys/select.h> in order to get the definition
of struct timeval.

"i_syssockio"

From i_sysioctl.U:

This variable conditionally defines "I_SYS_SOCKIO" to
indicate to the C program that socket ioctl codes may
be found in <sys/sockio.h> instead of <sys/ioctl.h>.

"i_sysstat"

From i_sysstat.U:

This variable conditionally defines the "I_SYS_STAT"
symbol, and indicates whether a C program should
include <sys/stat.h>.

"i_sysstatfs"

From i_sysstatfs.U:

This variable conditionally defines the "I_SYSSTATFS"
symbol, and indicates whether a C program should
include <sys/statfs.h>.

"i_sysstatvfs"

From i_sysstatvfs.U:

This variable conditionally defines the "I_SYSSTATVFS"
symbol, and indicates whether a C program should
include <sys/statvfs.h>.

"i_systime"

From i_time.U:

This variable conditionally defines "I_SYS_TIME",
which indicates to the C program that it should
include <sys/time.h>.

"i_systimek"

From i_time.U:

This variable conditionally defines "I_SYS_TIME_KER
NEL", which indicates to the C program that it should
include <sys/time.h> with "KERNEL" defined.

"i_systimes"

From i_systimes.U:

This variable conditionally defines the "I_SYS_TIMES"
symbol, and indicates whether a C program should
include <sys/times.h>.

"i_systypes"

From i_systypes.U:

This variable conditionally defines the "I_SYS_TYPES"
symbol, and indicates whether a C program should
include <sys/types.h>.

"i_sysuio"

From i_sysuio.U:

This variable conditionally defines the "I_SYSUIO"
symbol, and indicates whether a C program should
include <sys/uio.h>.

"i_sysun"

From i_sysun.U:

This variable conditionally defines "I_SYS_UN", which
indicates to the C program that it should include
<sys/un.h> to get "UNIX" domain socket definitions.

"i_sysutsname"

From i_sysutsname.U:

This variable conditionally defines the "I_SYSUTSNAME"
symbol, and indicates whether a C program should
include <sys/utsname.h>.

"i_sysvfs"

From i_sysvfs.U:

This variable conditionally defines the "I_SYSVFS"
symbol, and indicates whether a C program should
include <sys/vfs.h>.

"i_syswait"

From i_syswait.U:

This variable conditionally defines "I_SYS_WAIT",
which indicates to the C program that it should
include <sys/wait.h>.

"i_termio"

From i_termio.U:

This variable conditionally defines the "I_TERMIO"
symbol, which indicates to the C program that it
should include <termio.h> rather than <sgtty.h>.

"i_termios"

From i_termio.U:

This variable conditionally defines the "I_TERMIOS"
symbol, which indicates to the C program that the
"POSIX" <termios.h> file is to be included.

"i_time"

From i_time.U:

This variable conditionally defines "I_TIME", which
indicates to the C program that it should include
<time.h>.

"i_unistd"

From i_unistd.U:

This variable conditionally defines the "I_UNISTD"
symbol, and indicates whether a C program should
include <unistd.h>.

"i_ustat"

From i_ustat.U:

This variable conditionally defines the "I_USTAT" sym
bol, and indicates whether a C program should include
<ustat.h>.

"i_utime"

From i_utime.U:

This variable conditionally defines the "I_UTIME" sym
bol, and indicates whether a C program should include
<utime.h>.

"i_values"

From i_values.U:

This variable conditionally defines the "I_VALUES"
symbol, and indicates whether a C program may include
<values.h> to get symbols like "MAXLONG" and friends.

"i_varargs"

From i_varhdr.U:

This variable conditionally defines "I_VARARGS", which
indicates to the C program that it should include
<varargs.h>.

"i_varhdr"

From i_varhdr.U:

Contains the name of the header to be included to get
va_dcl definition. Typically one of varargs.h or stdarg.h.

"i_vfork"

From i_vfork.U:

This variable conditionally defines the "I_VFORK" sym
bol, and indicates whether a C program should include
vfork.h.

"ignore_versioned_solibs"

From libs.U:

This variable should be non-empty if non-versioned
shared libraries (libfoo.so.x.y) are to be ignored (because they cannot be linked against).

"inc_version_list"

From inc_version_list.U:

This variable specifies the list of subdirectories in
over which perl.c:incpush() and lib/lib.pm will auto matically search when adding directories to @"INC".
The elements in the list are separated by spaces.
This is only useful if you have a perl library direc
tory tree structured like the default one. See
"INSTALL" for how this works. The versioned site_perl
directory was introduced in 5.005, so that is the low
est possible value.

"inc_version_list_init"

From inc_version_list.U:

This variable holds the same list as inc_version_list,
but each item is enclosed in double quotes and sepa
rated by commas, suitable for use in the
"PERL_INC_VERSION_LIST" initialization.

"incpath"

From usrinc.U:

This variable must preceed the normal include path to
get hte right one, as in $incpath/usr/include or $inc_ path/usr/lib. Value can be "" or /bsd43 on mips.

"inews"

From Loc.U:

This variable is defined but not used by Configure.
The value is a plain '' and is not useful.

"installarchlib"

From archlib.U:

This variable is really the same as archlibexp but may
differ on those systems using "AFS". For extra porta
bility, only this variable should be used in make
files.

"installbin"

From bin.U:

This variable is the same as binexp unless "AFS" is
running in which case the user is explicitely prompted
for it. This variable should always be used in your
makefiles for maximum portability.

"installman1dir"

From man1dir.U:

This variable is really the same as man1direxp, unless
you are using "AFS" in which case it points to the
read/write location whereas man1direxp only points to
the read-only access location. For extra portability,
you should only use this variable within your make
files.

"installman3dir"

From man3dir.U:

This variable is really the same as man3direxp, unless
you are using "AFS" in which case it points to the
read/write location whereas man3direxp only points to
the read-only access location. For extra portability,
you should only use this variable within your make
files.

"installprefix"

From installprefix.U:

This variable holds the name of the directory below
which "make install" will install the package. For
most users, this is the same as prefix. However, it
is useful for installing the software into a different
(usually temporary) location after which it can be
bundled up and moved somehow to the final location
specified by prefix.

"installprefixexp"

From installprefix.U:

This variable holds the full absolute path of install
prefix with all ~-expansion done.

"installprivlib"

From privlib.U:

This variable is really the same as privlibexp but may
differ on those systems using "AFS". For extra porta
bility, only this variable should be used in make
files.

"installscript"

From scriptdir.U:

This variable is usually the same as scriptdirexp,
unless you are on a system running "AFS", in which
case they may differ slightly. You should always use
this variable within your makefiles for portability.

"installsitearch"

From sitearch.U:

This variable is really the same as sitearchexp but
may differ on those systems using "AFS". For extra
portability, only this variable should be used in
makefiles.

"installsitebin"

From sitebin.U:

This variable is usually the same as sitebinexp,
unless you are on a system running "AFS", in which
case they may differ slightly. You should always use
this variable within your makefiles for portability.

"installsitelib"

From sitelib.U:

This variable is really the same as sitelibexp but may
differ on those systems using "AFS". For extra porta
bility, only this variable should be used in make
files.

"installstyle"

From installstyle.U:

This variable describes the "style" of the perl
installation. This is intended to be useful for tools
that need to manipulate entire perl distributions.
Perl itself doesn't use this to find its libraries -the library directories are stored directly in Con_
fig.pm. Currently, there are only two styles: "lib"
and lib/perl5. The default library locations (e.g. privlib, sitelib) are either $prefix/lib or $pre_ fix/lib/perl5. The former is useful if $prefix is a directory dedicated to perl (e.g. /opt/perl), while the latter is useful if $prefix is shared by many
packages, e.g. if $prefix=/usr/local.

This may later be extended to include other informa
tion, so be careful with pattern-matching on the
results.

For compatibility with perl5.005 and earlier, the default setting is based on whether or not $prefix
contains the string "perl".

"installusrbinperl"

From instubperl.U:

This variable tells whether Perl should be installed
also as /usr/bin/perl in addition to $installbin/perl

"installvendorarch"

From vendorarch.U:

This variable is really the same as vendorarchexp but
may differ on those systems using "AFS". For extra
portability, only this variable should be used in
makefiles.

"installvendorbin"

From vendorbin.U:

This variable is really the same as vendorbinexp but
may differ on those systems using "AFS". For extra
portability, only this variable should be used in
makefiles.

"installvendorlib"

From vendorlib.U:

This variable is really the same as vendorlibexp but
may differ on those systems using "AFS". For extra
portability, only this variable should be used in
makefiles.

"intsize"

From intsize.U:

This variable contains the value of the "INTSIZE" sym
bol, which indicates to the C program how many bytes
there are in an int.

"issymlink"

From issymlink.U:

This variable holds the test command to test for a
symbolic link (if they are supported). Typical values
include "test -h" and "test -L".

"ivdformat"

From perlxvf.U:

This variable contains the format string used for
printing a Perl "IV" as a signed decimal integer.

"ivsize"

From perlxv.U:

This variable is the size of an "IV" in bytes.

"ivtype"

From perlxv.U:

This variable contains the C type used for Perl's
"IV".

k

"known_extensions"

From Extensions.U:

This variable holds a list of all "XS" extensions
included in the package.

"ksh"

From Loc.U:

This variable is defined but not used by Configure.
The value is a plain '' and is not useful.

l

"ld"

From dlsrc.U:

This variable indicates the program to be used to link
libraries for dynamic loading. On some systems, it is
"ld". On "ELF" systems, it should be $cc. Mostly,
we'll try to respect the hint file setting.

"lddlflags"

From dlsrc.U:

This variable contains any special flags that might
need to be passed to $ld to create a shared library
suitable for dynamic loading. It is up to the make
file to use it. For hpux, it should be "-b". For
sunos 4.1, it is empty.

"ldflags"

From ccflags.U:

This variable contains any additional C loader flags
desired by the user. It is up to the Makefile to use
this.

"ldflags_uselargefiles"

From uselfs.U:

This variable contains the loader flags needed by
large file builds and added to ldflags by hints files.

"ldlibpthname"

From libperl.U:

This variable holds the name of the shared library
search path, often "LD_LIBRARY_PATH". To get an empty
string, the hints file must set this to "none".

"less"

From Loc.U:

This variable is used internally by Configure to
determine the full pathname (if any) of the less pro
gram. After Configure runs, the value is reset to a
plain "less" and is not useful.

"lib_ext"

From Unix.U:

This is an old synonym for _a.

"libc"

From libc.U:

This variable contains the location of the C library.

"libperl"

From libperl.U:

The perl executable is obtained by linking perlmain.c with libperl, any static extensions (usually just
DynaLoader), and any other libraries needed on this
system. libperl is usually libperl.a, but can also be libperl.so.xxx if the user wishes to build a perl exe cutable with a shared library.

"libpth"

From libpth.U:

This variable holds the general path (space-separated)
used to find libraries. It is intended to be used by
other units.

"libs"

From libs.U:

This variable holds the additional libraries we want
to use. It is up to the Makefile to deal with it.
The list can be empty.

"libsdirs"

From libs.U:

This variable holds the directory names aka dirnames
of the libraries we found and accepted, duplicates are
removed.

"libsfiles"

From libs.U:

This variable holds the filenames aka basenames of the
libraries we found and accepted.

"libsfound"

From libs.U:

This variable holds the full pathnames of the
libraries we found and accepted.

"libspath"

From libs.U:

This variable holds the directory names probed for
libraries.

"libswanted"

From Myinit.U:

This variable holds a list of all the libraries we
want to search. The order is chosen to pick up the c
library ahead of ucb or bsd libraries for SVR4.

"libswanted_uselargefiles"

From uselfs.U:

This variable contains the libraries needed by large
file builds and added to ldflags by hints files. It
is a space separated list of the library names without
the "lib" prefix or any suffix, just like libswanted..

"line"

From Loc.U:

This variable is defined but not used by Configure.
The value is a plain '' and is not useful.

"lint"

From Loc.U:

This variable is defined but not used by Configure.
The value is a plain '' and is not useful.

"lkflags"

From ccflags.U:

This variable contains any additional C partial linker
flags desired by the user. It is up to the Makefile
to use this.

"ln"

From Loc.U:

This variable is used internally by Configure to
determine the full pathname (if any) of the ln pro
gram. After Configure runs, the value is reset to a
plain "ln" and is not useful.

"lns"

From lns.U:

This variable holds the name of the command to make
symbolic links (if they are supported). It can be
used in the Makefile. It is either "ln -s" or "ln"

"localtime_r_proto"

From d_localtime_r.U:

This variable encodes the prototype of localtime_r.
It is zero if d_localtime_r is undef, and one of the
"REENTRANT_PROTO_T_ABC" macros of reentr.h if d_local time_r is defined.

"locincpth"

From ccflags.U:

This variable contains a list of additional directo
ries to be searched by the compiler. The appropriate
"-I" directives will be added to ccflags. This is
intended to simplify setting local directories from
the Configure command line. It's not much, but it
parallels the loclibpth stuff in libpth.U.

"loclibpth"

From libpth.U:

This variable holds the paths (space-separated) used
to find local libraries. It is prepended to libpth,
and is intended to be easily set from the command
line.

"longdblsize"

From d_longdbl.U:

This variable contains the value of the "LONG_DOUBLE
SIZE" symbol, which indicates to the C program how
many bytes there are in a long double, if this system
supports long doubles.

"longlongsize"

From d_longlong.U:

This variable contains the value of the "LONGLONGSIZE"
symbol, which indicates to the C program how many
bytes there are in a long long, if this system sup
ports long long.

"longsize"

From intsize.U:

This variable contains the value of the "LONGSIZE"
symbol, which indicates to the C program how many
bytes there are in a long.

"lp"

From Loc.U:

This variable is defined but not used by Configure.
The value is a plain '' and is not useful.

"lpr"

From Loc.U:

This variable is defined but not used by Configure.
The value is a plain '' and is not useful.

"ls"

From Loc.U:

This variable is used internally by Configure to
determine the full pathname (if any) of the ls pro
gram. After Configure runs, the value is reset to a
plain "ls" and is not useful.

"lseeksize"

From lseektype.U:

This variable defines lseektype to be something like
off_t, long, or whatever type is used to declare lseek
offset's type in the kernel (which also appears to be
lseek's return type).

"lseektype"

From lseektype.U:

This variable defines lseektype to be something like
off_t, long, or whatever type is used to declare lseek
offset's type in the kernel (which also appears to be
lseek's return type).

m

"mail"

From Loc.U:

This variable is defined but not used by Configure.
The value is a plain '' and is not useful.

"mailx"

From Loc.U:

This variable is defined but not used by Configure.
The value is a plain '' and is not useful.

"make"

From Loc.U:

This variable is used internally by Configure to
determine the full pathname (if any) of the make pro
gram. After Configure runs, the value is reset to a
plain "make" and is not useful.

"make_set_make"

From make.U:

Some versions of "make" set the variable "MAKE". Oth
ers do not. This variable contains the string to be
included in Makefile.SH so that "MAKE" is set if needed, and not if not needed. Possible values are:
make_set_make="#" # If your make program han
dles this for you, make_set_make="MAKE=$make" # if
it doesn't. I used a comment character so that we can
distinguish a "set" value (from a previous config.sh or Configure "-D" option) from an uncomputed value.

"mallocobj"

From mallocsrc.U:

This variable contains the name of the malloc.o that this package generates, if that malloc.o is preferred over the system malloc. Otherwise the value is null.
This variable is intended for generating Makefiles.
See mallocsrc.

"mallocsrc"

From mallocsrc.U:

This variable contains the name of the malloc.c that comes with the package, if that malloc.c is preferred over the system malloc. Otherwise the value is null.
This variable is intended for generating Makefiles.

"malloctype"

From mallocsrc.U:

This variable contains the kind of ptr returned by
malloc and realloc.

"man1dir"

From man1dir.U:

This variable contains the name of the directory in
which manual source pages are to be put. It is the
responsibility of the Makefile.SH to get the value of this into the proper command. You must be prepared to
do the ~name expansion yourself.

"man1direxp"

From man1dir.U:

This variable is the same as the man1dir variable, but
is filename expanded at configuration time, for conve
nient use in makefiles.

"man1ext"

From man1dir.U:

This variable contains the extension that the manual
page should have: one of "n", "l", or 1. The Makefile
must supply the .. See man1dir.

"man3dir"

From man3dir.U:

This variable contains the name of the directory in
which manual source pages are to be put. It is the
responsibility of the Makefile.SH to get the value of this into the proper command. You must be prepared to
do the ~name expansion yourself.

"man3direxp"

From man3dir.U:

This variable is the same as the man3dir variable, but
is filename expanded at configuration time, for conve
nient use in makefiles.

"man3ext"

From man3dir.U:

This variable contains the extension that the manual
page should have: one of "n", "l", or 3. The Makefile
must supply the .. See man3dir.

M

"Mcc"

From Loc.U:

This variable is used internally by Configure to
determine the full pathname (if any) of the Mcc pro
gram. After Configure runs, the value is reset to a
plain "Mcc" and is not useful.

"mips_type"

From usrinc.U:

This variable holds the environment type for the mips
system. Possible values are "BSD 4.3" and "System V".

"mkdir"

From Loc.U:

This variable is used internally by Configure to
determine the full pathname (if any) of the mkdir pro
gram. After Configure runs, the value is reset to a
plain "mkdir" and is not useful.

"mmaptype"

From d_mmap.U:

This symbol contains the type of pointer returned by
mmap() (and simultaneously the type of the first argu
ment). It can be "void *" or "caddr_t".

"modetype"

From modetype.U:

This variable defines modetype to be something like
mode_t, int, unsigned short, or whatever type is used
to declare file modes for system calls.

"more"

From Loc.U:

This variable is used internally by Configure to
determine the full pathname (if any) of the more pro
gram. After Configure runs, the value is reset to a
plain "more" and is not useful.

"multiarch"

From multiarch.U:

This variable conditionally defines the "MULTIARCH"
symbol which signifies the presence of multiplatform
files. This is normally set by hints files.

"mv"

From Loc.U:

This variable is defined but not used by Configure.
The value is a plain '' and is not useful.

"myarchname"

From archname.U:

This variable holds the architecture name computed by
Configure in a previous run. It is not intended to be
perused by any user and should never be set in a hint
file.

"mydomain"

From myhostname.U:

This variable contains the eventual value of the
"MYDOMAIN" symbol, which is the domain of the host the
program is going to run on. The domain must be
appended to myhostname to form a complete host name.
The dot comes with mydomain, and need not be supplied
by the program.

"myhostname"

From myhostname.U:

This variable contains the eventual value of the
"MYHOSTNAME" symbol, which is the name of the host the
program is going to run on. The domain is not kept
with hostname, but must be gotten from mydomain. The
dot comes with mydomain, and need not be supplied by
the program.

"myuname"

From Oldconfig.U:

The output of "uname -a" if available, otherwise the
hostname. On Xenix, pseudo variables assignments in
the output are stripped, thank you. The whole thing is
then lower-cased.

n

"n" From n.U:

This variable contains the "-n" flag if that is what
causes the echo command to suppress newline. Other
wise it is null. Correct usage is $echo $n "prompt
for a question: $c".

"need_va_copy"

From need_va_copy.U:

This symbol, if defined, indicates that the system
stores the variable argument list datatype, va_list,
in a format that cannot be copied by simple assign
ment, so that some other means must be used when copy
ing is required. As such systems vary in their provi
sion (or non-provision) of copying mechanisms, handy.h defines a platform- "independent" macro,
Perl_va_copy(src, dst), to do the job.

"netdb_hlen_type"

From netdbtype.U:

This variable holds the type used for the 2nd argument
to gethostbyaddr(). Usually, this is int or size_t or unsigned. This is only useful if you have gethost_
byaddr(), naturally.

"netdb_host_type"

From netdbtype.U:

This variable holds the type used for the 1st argument
to gethostbyaddr(). Usually, this is char * or void *, possibly with or without a const prefix. This is
only useful if you have gethostbyaddr(), naturally.

"netdb_name_type"

From netdbtype.U:

This variable holds the type used for the argument to
gethostbyname(). Usually, this is char * or const char *. This is only useful if you have gethostby_ name(), naturally.

"netdb_net_type"

From netdbtype.U:

This variable holds the type used for the 1st argument
to getnetbyaddr(). Usually, this is int or long. This is only useful if you have getnetbyaddr(), natu rally.

"nm"

From Loc.U:

This variable is used internally by Configure to
determine the full pathname (if any) of the nm pro
gram. After Configure runs, the value is reset to a
plain "nm" and is not useful.

"nm_opt"

From usenm.U:

This variable holds the options that may be necessary
for nm.

"nm_so_opt"

From usenm.U:

This variable holds the options that may be necessary
for nm to work on a shared library but that can not be
used on an archive library. Currently, this is only
used by Linux, where nm --dynamic is *required* to get
symbols from an "ELF" library which has been stripped,
but nm --dynamic is *fatal* on an archive library.
Maybe Linux should just always set usenm=false.

"nonxs_ext"

From Extensions.U:

This variable holds a list of all non-xs extensions
included in the package. All of them will be built.

"nroff"

From Loc.U:

This variable is used internally by Configure to
determine the full pathname (if any) of the nroff pro
gram. After Configure runs, the value is reset to a
plain "nroff" and is not useful.

"nv_preserves_uv_bits"

From perlxv.U:

This variable indicates how many of bits type uvtype a
variable nvtype can preserve.

"nveformat"

From perlxvf.U:

This variable contains the format string used for
printing a Perl "NV" using %e-ish floating point for
mat.

"nvEUformat"

From perlxvf.U:

This variable contains the format string used for
printing a Perl "NV" using %E-ish floating point for
mat.

"nvfformat"

From perlxvf.U:

This variable confains the format string used for
printing a Perl "NV" using %f-ish floating point for
mat.

"nvFUformat"

From perlxvf.U:

This variable confains the format string used for
printing a Perl "NV" using %F-ish floating point for
mat.

"nvgformat"

From perlxvf.U:

This variable contains the format string used for
printing a Perl "NV" using %g-ish floating point for
mat.

"nvGUformat"

From perlxvf.U:

This variable contains the format string used for
printing a Perl "NV" using %G-ish floating point for
mat.

"nvsize"

From perlxv.U:

This variable is the size of an "NV" in bytes.

"nvtype"

From perlxv.U:

This variable contains the C type used for Perl's
"NV".

o

"o_nonblock"

From nblock_io.U:

This variable bears the symbol value to be used during
open() or fcntl() to turn on non-blocking I/O for a file descriptor. If you wish to switch between block
ing and non-blocking, you may try ioctl("FIOSNBIO")
instead, but that is only supported by some devices.

"obj_ext"

From Unix.U:

This is an old synonym for _o.

"old_pthread_create_joinable"

From d_pthrattrj.U:

This variable defines the constant to use for creating
joinable (aka undetached) pthreads. Unused if
pthread.h defines "PTHREAD_CREATE_JOINABLE". If used, possible values are "PTHREAD_CREATE_UNDETACHED" and
"__UNDETACHED".

"optimize"

From ccflags.U:

This variable contains any optimizer/debugger flag that should be used. It is up to the Makefile to use
it.

"orderlib"

From orderlib.U:

This variable is "true" if the components of libraries
must be ordered (with `lorder $* | tsort`) before
placing them in an archive. Set to "false" if ranlib
or ar can generate random libraries.

"osname"

From Oldconfig.U:

This variable contains the operating system name (e.g.
sunos, solaris, hpux, etc.). It can be useful later
on for setting defaults. Any spaces are replaced with
underscores. It is set to a null string if we can't
figure it out.

"osvers"

From Oldconfig.U:

This variable contains the operating system version
(e.g. 4.1.3, 5.2, etc.). It is primarily used for
helping select an appropriate hints file, but might be
useful elsewhere for setting defaults. It is set to
'' if we can't figure it out. We try to be flexible
about how much of the version number to keep, e.g. if
4.1.1, 4.1.2, and 4.1.3 are essentially the same for
this package, hints files might just be os_4.0 or
os_4.1, etc., not keeping separate files for each lit
tle release.

"otherlibdirs"

From otherlibdirs.U:

This variable contains a colon-separated set of paths
for the perl binary to search for additional library
files or modules. These directories will be tacked to
the end of @"INC". Perl will automatically search
below each path for version- and architecture-specific
directories. See inc_version_list for more details.
A value of " " means "none" and is used to preserve
this value for the next run through Configure.

p

"package"

From package.U:

This variable contains the name of the package being
constructed. It is primarily intended for the use of
later Configure units.

"pager"

From pager.U:

This variable contains the name of the preferred pager
on the system. Usual values are (the full pathnames
of) more, less, pg, or cat.

"passcat"

From nis.U:

This variable contains a command that produces the
text of the /etc/passwd file. This is normally "cat /etc/passwd", but can be "ypcat passwd" when "NIS" is used. On some systems, such as os390, there may be no
equivalent command, in which case this variable is
unset.

"patchlevel"

From patchlevel.U:

The patchlevel level of this package. The value of
patchlevel comes from the patchlevel.h file. In a version number such as 5.6.1, this is the 6. In
patchlevel.h, this is referred to as "PERL_VERSION".

"path_sep"

From Unix.U:

This is an old synonym for p_ in Head.U, the character used to separate elements in the command shell search
"PATH".

"perl5"

From perl5.U:

This variable contains the full path (if any) to a
previously installed perl5.005 or later suitable for running the script to determine inc_version_list.

"perl"

From Loc.U:

This variable is defined but not used by Configure.
The value is a plain '' and is not useful.

"perl_patchlevel"

From patchlevel.U:

This is the Perl patch level, a numeric change identi
fier, as defined by whichever source code maintenance
system is used to maintain the patches; currently Per
force. It does not correlate with the Perl version
numbers or the maintenance versus development
dichotomy except by also being increasing.

P

"PERL_REVISION"

From Oldsyms.U:

In a Perl version number such as 5.6.2, this is the 5.
This value is manually set in patchlevel.h

"PERL_SUBVERSION"

From Oldsyms.U:

In a Perl version number such as 5.6.2, this is the 2.
Values greater than 50 represent potentially unstable
development subversions. This value is manually set
in patchlevel.h

"PERL_VERSION"

From Oldsyms.U:

In a Perl version number such as 5.6.2, this is the 6.
This value is manually set in patchlevel.h

"perladmin"

From perladmin.U:

Electronic mail address of the perl5 administrator.

"perllibs"

From End.U:

The list of libraries needed by Perl only (any
libraries needed by extensions only will by dropped,
if using dynamic loading).

"perlpath"

From perlpath.U:

This variable contains the eventual value of the
"PERLPATH" symbol, which contains the name of the perl
interpreter to be used in shell scripts and in the
"eval "exec"" idiom. This variable is not necessarily
the pathname of the file containing the perl inter
preter; you must append the executable extension
(_exe) if it is not already present. Note that Perl
code that runs during the Perl build process cannot
reference this variable, as Perl may not have been
installed, or even if installed, may be a different
version of Perl.

"pg"

From Loc.U:

This variable is used internally by Configure to
determine the full pathname (if any) of the pg pro
gram. After Configure runs, the value is reset to a
plain "pg" and is not useful.

"phostname"

From myhostname.U:

This variable contains the eventual value of the
"PHOSTNAME" symbol, which is a command that can be fed
to popen() to get the host name. The program should probably not presume that the domain is or isn't there
already.

"pidtype"

From pidtype.U:

This variable defines "PIDTYPE" to be something like
pid_t, int, ushort, or whatever type is used to
declare process ids in the kernel.

"plibpth"

From libpth.U:

Holds the private path used by Configure to find out
the libraries. Its value is prepend to libpth. This
variable takes care of special machines, like the
mips. Usually, it should be empty.

"pm_apiversion"

From xs_apiversion.U:

This variable contains the version of the oldest perl
compatible with the present perl. (That is, pure perl
modules written for $pm_apiversion will still work for
the current version). perl.c:incpush() and lib/lib.pm will automatically search in $sitelib for older direc
tories across major versions back to pm_apiversion.
This is only useful if you have a perl library direc
tory tree structured like the default one. The ver
sioned site_perl library was introduced in 5.005, so
that's the default setting for this variable. It's
hard to imagine it changing before Perl6. It is
included here for symmetry with xs_apiveprsion -- the
searching algorithms will (presumably) be similar.
See the "INSTALL" file for how this works.

"pmake"

From Loc.U:

This variable is defined but not used by Configure.
The value is a plain '' and is not useful.

"pr"

From Loc.U:

This variable is defined but not used by Configure.
The value is a plain '' and is not useful.

"prefix"

From prefix.U:

This variable holds the name of the directory below
which the user will install the package. Usually,
this is /usr/local, and executables go in
/usr/local/bin, library stuff in /usr/local/lib, man pages in /usr/local/man, etc. It is only used to set defaults for things in bin.U, mansrc.U, privlib.U, or scriptdir.U.

"prefixexp"

From prefix.U:

This variable holds the full absolute path of the
directory below which the user will install the pack
age. Derived from prefix.

"privlib"

From privlib.U:

This variable contains the eventual value of the
"PRIVLIB" symbol, which is the name of the private
library for this package. It may have a ~ on the
front. It is up to the makefile to eventually create
this directory while performing installation (with ~
substitution).

"privlibexp"

From privlib.U:

This variable is the ~name expanded version of
privlib, so that you may use it directly in Makefiles
or shell scripts.

"procselfexe"

From d_procselfexe.U:

If d_procselfexe is defined, $procselfexe is the file
name of the symbolic link pointing to the absolute
pathname of the executing program.

"prototype"

From prototype.U:

This variable holds the eventual value of "CAN_PROTO
TYPE", which indicates the C compiler can handle
funciton prototypes.

"ptrsize"

From ptrsize.U:

This variable contains the value of the "PTRSIZE" sym
bol, which indicates to the C program how many bytes
there are in a pointer.

q

"quadkind"

From quadtype.U:

This variable, if defined, encodes the type of a quad:
1 = int, 2 = long, 3 = long long, 4 = int64_t.

"quadtype"

From quadtype.U:

This variable defines Quad_t to be something like
long, int, long long, int64_t, or whatever type is
used for 64-bit integers.

r

"randbits"

From randfunc.U:

Indicates how many bits are produced by the function
used to generate normalized random numbers.

"randfunc"

From randfunc.U:

Indicates the name of the random number function to
use. Values include drand48, random, and rand. In C
programs, the "Drand01" macro is defined to generate
uniformly distributed random numbers over the range
[0., 1.[ (see drand01 and nrand).

"random_r_proto"

From d_random_r.U:

This variable encodes the prototype of random_r. It
is zero if d_random_r is undef, and one of the "REEN
TRANT_PROTO_T_ABC" macros of reentr.h if d_random_r is defined.

"randseedtype"

From randfunc.U:

Indicates the type of the argument of the seedfunc.

"ranlib"

From orderlib.U:

This variable is set to the pathname of the ranlib
program, if it is needed to generate random libraries.
Set to ":" if ar can generate random libraries or if
random libraries are not supported

"rd_nodata"

From nblock_io.U:

This variable holds the return code from read() when
no data is present. It should be -1, but some systems
return 0 when "O_NDELAY" is used, which is a shame
because you cannot make the difference between no data
and an EOF.. Sigh!

"readdir64_r_proto"

From d_readdir64_r.U:

This variable encodes the prototype of readdir64_r.
It is zero if d_readdir64_r is undef, and one of the
"REENTRANT_PROTO_T_ABC" macros of reentr.h if d_read dir64_r is defined.

"readdir_r_proto"

From d_readdir_r.U:

This variable encodes the prototype of readdir_r. It
is zero if d_readdir_r is undef, and one of the "REEN
TRANT_PROTO_T_ABC" macros of reentr.h if d_readdir_r is defined.

"revision"

From patchlevel.U:

The value of revision comes from the patchlevel.h file. In a version number such as 5.6.1, this is the
5. In patchlevel.h, this is referred to as "PERL_REVISION".

"rm"
From Loc.U:

This variable is used internally by Configure to
determine the full pathname (if any) of the rm pro
gram. After Configure runs, the value is reset to a
plain "rm" and is not useful.

"rmail"
From Loc.U:

This variable is defined but not used by Configure.
The value is a plain '' and is not useful.

"run"
From Cross.U:

This variable contains the command used by Configure
to copy and execute a cross-compiled executable in the
target host. Useful and available only during Perl
build. Empty string '' if not cross-compiling.

"runnm"
From usenm.U:

This variable contains "true" or "false" depending
whether the nm extraction should be performed or not,
according to the value of usenm and the flags on the
Configure command line.

s

"sched_yield"
From d_pthread_y.U:

This variable defines the way to yield the execution
of the current thread.

"scriptdir"
From scriptdir.U:

This variable holds the name of the directory in which
the user wants to put publicly scripts for the package
in question. It is either the same directory as for
binaries, or a special one that can be mounted across
different architectures, like /usr/share. Programs must be prepared to deal with ~name expansion.

"scriptdirexp"
From scriptdir.U:

This variable is the same as scriptdir, but is file
name expanded at configuration time, for programs not
wanting to bother with it.

"sed"
From Loc.U:

This variable is used internally by Configure to
determine the full pathname (if any) of the sed pro
gram. After Configure runs, the value is reset to a
plain "sed" and is not useful.

"seedfunc"
From randfunc.U:

Indicates the random number generating seed function.
Values include srand48, srandom, and srand.

"selectminbits"
From selectminbits.U:

This variable holds the minimum number of bits oper
ated by select. That is, if you do select(n, ...),
how many bits at least will be cleared in the masks if
some activity is detected. Usually this is either n
or 32*ceil(n/32), especially many little-endians do
the latter. This is only useful if you have select(), naturally.

"selecttype"
From selecttype.U:

This variable holds the type used for the 2nd, 3rd,
and 4th arguments to select. Usually, this is "fd_set
*", if "HAS_FD_SET" is defined, and "int *" otherwise.
This is only useful if you have select(), naturally.

"sendmail"
From Loc.U:

This variable is defined but not used by Configure.
The value is a plain '' and is not useful.

"setgrent_r_proto"
From d_setgrent_r.U:

This variable encodes the prototype of setgrent_r. It
is zero if d_setgrent_r is undef, and one of the
"REENTRANT_PROTO_T_ABC" macros of reentr.h if d_set grent_r is defined.

"sethostent_r_proto"
From d_sethostent_r.U:

This variable encodes the prototype of sethostent_r.
It is zero if d_sethostent_r is undef, and one of the
"REENTRANT_PROTO_T_ABC" macros of reentr.h if
d_sethostent_r is defined.

"setlocale_r_proto"
From d_setlocale_r.U:

This variable encodes the prototype of setlocale_r.
It is zero if d_setlocale_r is undef, and one of the
"REENTRANT_PROTO_T_ABC" macros of reentr.h if d_setlo cale_r is defined.

"setnetent_r_proto"
From d_setnetent_r.U:

This variable encodes the prototype of setnetent_r.
It is zero if d_setnetent_r is undef, and one of the
"REENTRANT_PROTO_T_ABC" macros of reentr.h if d_setne tent_r is defined.

"setprotoent_r_proto"
From d_setprotoent_r.U:

This variable encodes the prototype of setprotoent_r.
It is zero if d_setprotoent_r is undef, and one of the
"REENTRANT_PROTO_T_ABC" macros of reentr.h if d_set protoent_r is defined.

"setpwent_r_proto"
From d_setpwent_r.U:

This variable encodes the prototype of setpwent_r. It
is zero if d_setpwent_r is undef, and one of the
"REENTRANT_PROTO_T_ABC" macros of reentr.h if d_setp went_r is defined.

"setservent_r_proto"
From d_setservent_r.U:

This variable encodes the prototype of setservent_r.
It is zero if d_setservent_r is undef, and one of the
"REENTRANT_PROTO_T_ABC" macros of reentr.h if d_set servent_r is defined.

"sh"
From sh.U:

This variable contains the full pathname of the shell
used on this system to execute Bourne shell scripts.
Usually, this will be /bin/sh, though it's possible
that some systems will have /bin/ksh, /bin/pdksh, /bin/ash, /bin/bash, or even something such as D:/bin/sh.exe. This unit comes before Options.U, so you can't set sh with a "-D" option, though you can
override this (and startsh) with "-O -Dsh=/bin/what
ever -Dstartsh=whatever"

"shar"
From Loc.U:

This variable is defined but not used by Configure.
The value is a plain '' and is not useful.

"sharpbang"
From spitshell.U:

This variable contains the string #! if this system
supports that construct.

"shmattype"
From d_shmat.U:

This symbol contains the type of pointer returned by
shmat(). It can be "void *" or "char *".

"shortsize"
From intsize.U:

This variable contains the value of the "SHORTSIZE"
symbol which indicates to the C program how many bytes
there are in a short.

"shrpenv"
From libperl.U:

If the user builds a shared libperl.so, then we need to tell the "perl" executable where it will be able to
find the installed libperl.so. One way to do this on some systems is to set the environment variable
"LD_RUN_PATH" to the directory that will be the final
location of the shared libperl.so. The makefile can use this with something like $shrpenv $("CC") -o perl
perlmain.o $libperl $libs Typical values are
shrpenv="env "LD_RUN_PATH"=$archlibexp/"CORE"" or shrpenv='' See the main perl Makefile.SH for actual working usage. Alternatively, we might be able to use
a command line option such as -R $archlibexp/"CORE" (Solaris) or -Wl,-rpath $archlibexp/"CORE" (Linux).

"shsharp"
From spitshell.U:

This variable tells further Configure units whether
your sh can handle # comments.

"sig_count"
From sig_name.U:

This variable holds a number larger than the largest
valid signal number. This is usually the same as the
"NSIG" macro.

"sig_name"
From sig_name.U:

This variable holds the signal names, space separated.
The leading "SIG" in signal name is removed. A "ZERO"
is prepended to the list. This is currently not used.

"sig_name_init"
From sig_name.U:

This variable holds the signal names, enclosed in dou
ble quotes and separated by commas, suitable for use
in the "SIG_NAME" definition below. A "ZERO" is
prepended to the list, and the list is terminated with
a plain 0. The leading "SIG" in signal names is
removed. See sig_num.

"sig_num"
From sig_name.U:

This variable holds the signal numbers, space sepa
rated. A "ZERO" is prepended to the list (correspond
ing to the fake "SIGZERO"), and the list is terminated
with a 0. Those numbers correspond to the value of
the signal listed in the same place within the
sig_name list.

"sig_num_init"
From sig_name.U:

This variable holds the signal numbers, enclosed in
double quotes and separated by commas, suitable for
use in the "SIG_NUM" definition below. A "ZERO" is
prepended to the list, and the list is terminated with
a plain 0.

"sig_size"
From sig_name.U:

This variable contains the number of elements of the
sig_name and sig_num arrays, excluding the final
"NULL" entry.

"signal_t"
From d_voidsig.U:

This variable holds the type of the signal handler
(void or int).

"sitearch"
From sitearch.U:

This variable contains the eventual value of the
"SITEARCH" symbol, which is the name of the private
library for this package. It may have a ~ on the
front. It is up to the makefile to eventually create
this directory while performing installation (with ~
substitution). The standard distribution will put
nothing in this directory. After perl has been
installed, users may install their own local architec
ture-dependent modules in this directory with Make
Maker Makefile.PL or equivalent. See "INSTALL" for details.

"sitearchexp"
From sitearch.U:

This variable is the ~name expanded version of
sitearch, so that you may use it directly in Makefiles
or shell scripts.

"sitebin"
From sitebin.U:

This variable holds the name of the directory in which
the user wants to put add-on publicly executable files
for the package in question. It is most often a local
directory such as /usr/local/bin. Programs using this variable must be prepared to deal with ~name substitu
tion. The standard distribution will put nothing in
this directory. After perl has been installed, users
may install their own local executables in this direc
tory with MakeMaker Makefile.PL or equivalent. See "INSTALL" for details.

"sitebinexp"
From sitebin.U:

This is the same as the sitebin variable, but is file
name expanded at configuration time, for use in your
makefiles.

"sitelib"
From sitelib.U:

This variable contains the eventual value of the
"SITELIB" symbol, which is the name of the private
library for this package. It may have a ~ on the
front. It is up to the makefile to eventually create
this directory while performing installation (with ~
substitution). The standard distribution will put
nothing in this directory. After perl has been
installed, users may install their own local architec
ture-independent modules in this directory with Make
Maker Makefile.PL or equivalent. See "INSTALL" for details.

"sitelib_stem"
From sitelib.U:

This variable is $sitelibexp with any trailing ver
sion-specific component removed. The elements in
inc_version_list (inc_version_list.U) can be tacked onto this variable to generate a list of directories
to search.

"sitelibexp"
From sitelib.U:

This variable is the ~name expanded version of
sitelib, so that you may use it directly in Makefiles
or shell scripts.

"siteprefix"
From siteprefix.U:

This variable holds the full absolute path of the
directory below which the user will install add-on
packages. See "INSTALL" for usage and examples.

"siteprefixexp"
From siteprefix.U:

This variable holds the full absolute path of the
directory below which the user will install add-on
packages. Derived from siteprefix.

"sizesize"
From sizesize.U:

This variable contains the size of a sizetype in
bytes.

"sizetype"
From sizetype.U:

This variable defines sizetype to be something like
size_t, unsigned long, or whatever type is used to
declare length parameters for string functions.

"sleep"
From Loc.U:

This variable is defined but not used by Configure.
The value is a plain '' and is not useful.

"smail"
From Loc.U:

This variable is defined but not used by Configure.
The value is a plain '' and is not useful.

"so"
From so.U:

This variable holds the extension used to identify
shared libraries (also known as shared objects) on the
system. Usually set to "so".

"sockethdr"
From d_socket.U:

This variable has any cpp "-I" flags needed for socket
support.

"socketlib"
From d_socket.U:

This variable has the names of any libraries needed
for socket support.

"socksizetype"
From socksizetype.U:

This variable holds the type used for the size argu
ment for various socket calls like accept. Usual val
ues include socklen_t, size_t, and int.

"sort"
From Loc.U:

This variable is used internally by Configure to
determine the full pathname (if any) of the sort pro
gram. After Configure runs, the value is reset to a
plain "sort" and is not useful.

"spackage"
From package.U:

This variable contains the name of the package being
constructed, with the first letter uppercased, i.e.
suitable for starting sentences.

"spitshell"
From spitshell.U:

This variable contains the command necessary to spit
out a runnable shell on this system. It is either cat
or a grep "-v" for # comments.

"sPRId64"
From quadfio.U:

This variable, if defined, contains the string used by
stdio to format 64-bit decimal numbers (format "d")
for output.

"sPRIeldbl"
From longdblfio.U:

This variable, if defined, contains the string used by
stdio to format long doubles (format "e") for output.

"sPRIEUldbl"
From longdblfio.U:

This variable, if defined, contains the string used by
stdio to format long doubles (format "E") for output.
The "U" in the name is to separate this from sPRIeldbl
so that even case-blind systems can see the differ
ence.

"sPRIfldbl"
From longdblfio.U:

This variable, if defined, contains the string used by
stdio to format long doubles (format "f") for output.

"sPRIFUldbl"
From longdblfio.U:

This variable, if defined, contains the string used by
stdio to format long doubles (format "F") for output.
The "U" in the name is to separate this from sPRIfldbl
so that even case-blind systems can see the differ
ence.

"sPRIgldbl"
From longdblfio.U:

This variable, if defined, contains the string used by
stdio to format long doubles (format "g") for output.

"sPRIGUldbl"
From longdblfio.U:

This variable, if defined, contains the string used by
stdio to format long doubles (format "G") for output.
The "U" in the name is to separate this from sPRIgldbl
so that even case-blind systems can see the differ
ence.

"sPRIi64"
From quadfio.U:

This variable, if defined, contains the string used by
stdio to format 64-bit decimal numbers (format "i")
for output.

"sPRIo64"
From quadfio.U:

This variable, if defined, contains the string used by
stdio to format 64-bit octal numbers (format "o") for
output.

"sPRIu64"
From quadfio.U:

This variable, if defined, contains the string used by
stdio to format 64-bit unsigned decimal numbers (for
mat "u") for output.

"sPRIx64"
From quadfio.U:

This variable, if defined, contains the string used by
stdio to format 64-bit hexadecimal numbers (format
"x") for output.

"sPRIXU64"
From quadfio.U:

This variable, if defined, contains the string used by
stdio to format 64-bit hExADECimAl numbers (format
"X") for output. The "U" in the name is to separate
this from sPRIx64 so that even case-blind systems can
see the difference.

"srand48_r_proto"
From d_srand48_r.U:

This variable encodes the prototype of srand48_r. It
is zero if d_srand48_r is undef, and one of the "REEN
TRANT_PROTO_T_ABC" macros of reentr.h if d_srand48_r is defined.

"srandom_r_proto"
From d_srandom_r.U:

This variable encodes the prototype of srandom_r. It
is zero if d_srandom_r is undef, and one of the "REEN
TRANT_PROTO_T_ABC" macros of reentr.h if d_srandom_r is defined.

"src"
From src.U:

This variable holds the path to the package source. It
is up to the Makefile to use this variable and set
"VPATH" accordingly to find the sources remotely.

"sSCNfldbl"
From longdblfio.U:

This variable, if defined, contains the string used by
stdio to format long doubles (format "f") for input.

"ssizetype"
From ssizetype.U:

This variable defines ssizetype to be something like
ssize_t, long or int. It is used by functions that
return a count of bytes or an error condition. It
must be a signed type. We will pick a type such that
sizeof(SSize_t) == sizeof(Size_t).

"startperl"
From startperl.U:

This variable contains the string to put on the front
of a perl script to make sure (hopefully) that it runs
with perl and not some shell. Of course, that leading
line must be followed by the classical perl idiom:
eval 'exec perl -S $0 ${1+$@}' if $run
ning_under_some_shell; to guarantee perl startup
should the shell execute the script. Note that this
magic incatation is not understood by csh.

"startsh"
From startsh.U:

This variable contains the string to put on the front
of a shell script to make sure (hopefully) that it
runs with sh and not some other shell.

"static_ext"
From Extensions.U:

This variable holds a list of "XS" extension files we
want to link statically into the package. It is used
by Makefile.

"stdchar"
From stdchar.U:

This variable conditionally defines "STDCHAR" to be
the type of char used in stdio.h. It has the values "unsigned char" or "char".

"stdio_base"
From d_stdstdio.U:

This variable defines how, given a "FILE" pointer, fp,
to access the _base field (or equivalent) of stdio.h's "FILE" structure. This will be used to define the
macro FILE_base(fp).

"stdio_bufsiz"
From d_stdstdio.U:

This variable defines how, given a "FILE" pointer, fp,
to determine the number of bytes store in the I/O
buffer pointer to by the _base field (or equivalent)
of stdio.h's "FILE" structure. This will be used to define the macro FILE_bufsiz(fp).

"stdio_cnt"
From d_stdstdio.U:

This variable defines how, given a "FILE" pointer, fp,
to access the _cnt field (or equivalent) of stdio.h's "FILE" structure. This will be used to define the
macro FILE_cnt(fp).

"stdio_filbuf"
From d_stdstdio.U:

This variable defines how, given a "FILE" pointer, fp,
to tell stdio to refill its internal buffers (?).
This will be used to define the macro FILE_filbuf(fp).

"stdio_ptr"
From d_stdstdio.U:

This variable defines how, given a "FILE" pointer, fp,
to access the _ptr field (or equivalent) of stdio.h's "FILE" structure. This will be used to define the
macro FILE_ptr(fp).

"stdio_stream_array"
From stdio_streams.U:

This variable tells the name of the array holding the
stdio streams. Usual values include _iob, __iob, and
__sF.

"strerror_r_proto"
From d_strerror_r.U:

This variable encodes the prototype of strerror_r. It
is zero if d_strerror_r is undef, and one of the
"REENTRANT_PROTO_T_ABC" macros of reentr.h if d_str error_r is defined.

"strings"
From i_string.U:

This variable holds the full path of the string header
that will be used. Typically /usr/include/string.h or /usr/include/strings.h.

"submit"
From Loc.U:

This variable is defined but not used by Configure.
The value is a plain '' and is not useful.

"subversion"
From patchlevel.U:

The subversion level of this package. The value of
subversion comes from the patchlevel.h file. In a version number such as 5.6.1, this is the 1. In
patchlevel.h, this is referred to as "PERL_SUBVER SION". This is unique to perl.

"sysman"
From sysman.U:

This variable holds the place where the manual is
located on this system. It is not the place where the
user wants to put his manual pages. Rather it is the
place where Configure may look to find manual for unix
commands (section 1 of the manual usually). See man
src.

t

"tail"
From Loc.U:

This variable is defined but not used by Configure.
The value is a plain '' and is not useful.

"tar"
From Loc.U:

This variable is defined but not used by Configure.
The value is a plain '' and is not useful.

"targetarch"
From Cross.U:

If cross-compiling, this variable contains the target
architecture. If not, this will be empty.

"tbl"
From Loc.U:

This variable is defined but not used by Configure.
The value is a plain '' and is not useful.

"tee"
From Loc.U:

This variable is defined but not used by Configure.
The value is a plain '' and is not useful.

"test"
From Loc.U:

This variable is used internally by Configure to
determine the full pathname (if any) of the test pro
gram. After Configure runs, the value is reset to a
plain "test" and is not useful.

"timeincl"
From i_time.U:

This variable holds the full path of the included time
header(s).

"timetype"
From d_time.U:

This variable holds the type returned by time(). It
can be long, or time_t on "BSD" sites (in which case
<sys/types.h> should be included). Anyway, the type
Time_t should be used.

"tmpnam_r_proto"
From d_tmpnam_r.U:

This variable encodes the prototype of tmpnam_r. It
is zero if d_tmpnam_r is undef, and one of the "REEN
TRANT_PROTO_T_ABC" macros of reentr.h if d_tmpnam_r is defined.

"to"
From Cross.U:

This variable contains the command used by Configure
to copy to from the target host. Useful and available
only during Perl build. The string ":" if not
cross-compiling.

"touch"
From Loc.U:

This variable is used internally by Configure to
determine the full pathname (if any) of the touch pro
gram. After Configure runs, the value is reset to a
plain "touch" and is not useful.

"tr"
From Loc.U:

This variable is used internally by Configure to
determine the full pathname (if any) of the tr pro
gram. After Configure runs, the value is reset to a
plain "tr" and is not useful.

"trnl"
From trnl.U:

This variable contains the value to be passed to the
tr(1) command to transliterate a newline. Typical
values are " 12" and "0. This is needed for
"EBCDIC" systems where newline is not necessarily
" 12".

"troff"
From Loc.U:

This variable is defined but not used by Configure.
The value is a plain '' and is not useful.

"ttyname_r_proto"
From d_ttyname_r.U:

This variable encodes the prototype of ttyname_r. It
is zero if d_ttyname_r is undef, and one of the "REEN
TRANT_PROTO_T_ABC" macros of reentr.h if d_ttyname_r is defined.

u

"u16size"
From perlxv.U:

This variable is the size of an U16 in bytes.

"u16type"
From perlxv.U:

This variable contains the C type used for Perl's U16.

"u32size"
From perlxv.U:

This variable is the size of an U32 in bytes.

"u32type"
From perlxv.U:

This variable contains the C type used for Perl's U32.

"u64size"
From perlxv.U:

This variable is the size of an U64 in bytes.

"u64type"
From perlxv.U:

This variable contains the C type used for Perl's U64.

"u8size"
From perlxv.U:

This variable is the size of an U8 in bytes.

"u8type"
From perlxv.U:

This variable contains the C type used for Perl's U8.

"uidformat"
From uidf.U:

This variable contains the format string used for
printing a Uid_t.

"uidsign"
From uidsign.U:

This variable contains the signedness of a uidtype. 1
for unsigned, -1 for signed.

"uidsize"
From uidsize.U:

This variable contains the size of a uidtype in bytes.

"uidtype"
From uidtype.U:

This variable defines Uid_t to be something like
uid_t, int, ushort, or whatever type is used to
declare user ids in the kernel.

"uname"
From Loc.U:

This variable is used internally by Configure to
determine the full pathname (if any) of the uname pro
gram. After Configure runs, the value is reset to a
plain "uname" and is not useful.

"uniq"
From Loc.U:

This variable is used internally by Configure to
determine the full pathname (if any) of the uniq pro
gram. After Configure runs, the value is reset to a
plain "uniq" and is not useful.

"uquadtype"
From quadtype.U:

This variable defines Uquad_t to be something like
unsigned long, unsigned int, unsigned long long,
uint64_t, or whatever type is used for 64-bit inte
gers.

"use5005threads"
From usethreads.U:

This variable conditionally defines the
USE_5005THREADS symbol, and indicates that Perl should
be built to use the 5.005-based threading implementa
tion.

"use64bitall"
From use64bits.U:

This variable conditionally defines the USE_64_BIT_ALL
symbol, and indicates that 64-bit integer types should
be used when available. The maximal possible 64-bit
ness is employed: LP64 or ILP64, meaning that you will
be able to use more than 2 gigabytes of memory. This
mode is even more binary incompatible than
USE_64_BIT_INT. You may not be able to run the result
ing executable in a 32-bit "CPU" at all or you may
need at least to reboot your "OS" to 64-bit mode.

"use64bitint"
From use64bits.U:

This variable conditionally defines the USE_64_BIT_INT
symbol, and indicates that 64-bit integer types should
be used when available. The minimal possible 64-bit
ness is employed, just enough to get 64-bit integers
into Perl. This may mean using for example "long
longs", while your memory may still be limited to 2
gigabytes.

"usecrosscompile"
From Cross.U:

This variable conditionally defines the
"USE_CROSS_COMPILE" symbol, and indicates that Perl
has been cross-compiled.

"usedl"
From dlsrc.U:

This variable indicates if the system supports dynamic
loading of some sort. See also dlsrc and dlobj.

"useithreads"
From usethreads.U:

This variable conditionally defines the "USE_ITHREADS"
symbol, and indicates that Perl should be built to use
the interpreter-based threading implementation.

"uselargefiles"
From uselfs.U:

This variable conditionally defines the
"USE_LARGE_FILES" symbol, and indicates that large
file interfaces should be used when available.

"uselongdouble"
From uselongdbl.U:

This variable conditionally defines the "USE_LONG_DOU
BLE" symbol, and indicates that long doubles should be
used when available.

"usemorebits"
From usemorebits.U:

This variable conditionally defines the
"USE_MORE_BITS" symbol, and indicates that explicit
64-bit interfaces and long doubles should be used when
available.

"usemultiplicity"
From usemultiplicity.U:

This variable conditionally defines the "MULTIPLICITY"
symbol, and indicates that Perl should be built to use
multiplicity.

"usemymalloc"
From mallocsrc.U:

This variable contains y if the malloc that comes with
this package is desired over the system's version of
malloc. People often include special versions of mal
loc for effiency, but such versions are often less
portable. See also mallocsrc and mallocobj. If this
is "y", then -lmalloc is removed from $libs.

"usenm"
From usenm.U:

This variable contains "true" or "false" depending
whether the nm extraction is wanted or not.

"useopcode"
From Extensions.U:

This variable holds either "true" or "false" to indi
cate whether the Opcode extension should be used. The
sole use for this currently is to allow an easy mecha
nism for users to skip the Opcode extension from the
Configure command line.

"useperlio"
From useperlio.U:

This variable conditionally defines the "USE_PERLIO"
symbol, and indicates that the PerlIO abstraction
should be used throughout.

"useposix"
From Extensions.U:

This variable holds either "true" or "false" to indi
cate whether the "POSIX" extension should be used.
The sole use for this currently is to allow an easy
mechanism for hints files to indicate that "POSIX"
will not compile on a particular system.

"usereentrant"
From usethreads.U:

This variable conditionally defines the "USE_REEN
TRANT_API" symbol, which indicates that the thread
code may try to use the various _r versions of library
functions. This is only potentially meaningful if
usethreads is set and is very experimental, it is not
even prompted for.

"usesfio"
From d_sfio.U:

This variable is set to true when the user agrees to
use sfio. It is set to false when sfio is not avail
able or when the user explicitely requests not to use
sfio. It is here primarily so that command-line set
tings can override the auto-detection of d_sfio with
out running into a "WHOA THERE".

"useshrplib"
From libperl.U:

This variable is set to "yes" if the user wishes to
build a shared libperl, and "no" otherwise.

"usesocks"
From usesocks.U:

This variable conditionally defines the "USE_SOCKS"
symbol, and indicates that Perl should be built to use
"SOCKS".

"usethreads"
From usethreads.U:

This variable conditionally defines the "USE_THREADS"
symbol, and indicates that Perl should be built to use
threads.

"usevendorprefix"
From vendorprefix.U:

This variable tells whether the vendorprefix and con
sequently other vendor* paths are in use.

"usevfork"
From d_vfork.U:

This variable is set to true when the user accepts to
use vfork. It is set to false when no vfork is avail
able or when the user explicitely requests not to use
vfork.

"usrinc"
From usrinc.U:

This variable holds the path of the include files,
which is usually /usr/include. It is mainly used by other Configure units.

"uuname"
From Loc.U:

This variable is defined but not used by Configure.
The value is a plain '' and is not useful.

"uvoformat"
From perlxvf.U:

This variable contains the format string used for
printing a Perl "UV" as an unsigned octal integer.

"uvsize"
From perlxv.U:

This variable is the size of a "UV" in bytes.

"uvtype"
From perlxv.U:

This variable contains the C type used for Perl's
"UV".

"uvuformat"
From perlxvf.U:

This variable contains the format string used for
printing a Perl "UV" as an unsigned decimal integer.

"uvxformat"
From perlxvf.U:

This variable contains the format string used for
printing a Perl "UV" as an unsigned hexadecimal inte
ger in lowercase abcdef.

"uvXUformat"
From perlxvf.U:

This variable contains the format string used for
printing a Perl "UV" as an unsigned hexadecimal inte
ger in uppercase "ABCDEF".

v

"vendorarch"
From vendorarch.U:

This variable contains the value of the "PERL_VENDO
RARCH" symbol. It may have a ~ on the front. The
standard distribution will put nothing in this direc
tory. Vendors who distribute perl may wish to place
their own architecture-dependent modules and exten
sions in this directory with MakeMaker Makefile.PL "INSTALLDIRS"=vendor or equivalent. See "INSTALL" for
details.

"vendorarchexp"
From vendorarch.U:

This variable is the ~name expanded version of vendo
rarch, so that you may use it directly in Makefiles or
shell scripts.

"vendorbin"
From vendorbin.U:

This variable contains the eventual value of the
"VENDORBIN" symbol. It may have a ~ on the front.
The standard distribution will put nothing in this
directory. Vendors who distribute perl may wish to
place additional binaries in this directory with Make
Maker Makefile.PL "INSTALLDIRS"=vendor or equivalent. See "INSTALL" for details.

"vendorbinexp"
From vendorbin.U:

This variable is the ~name expanded version of ven
dorbin, so that you may use it directly in Makefiles
or shell scripts.

"vendorlib"
From vendorlib.U:

This variable contains the eventual value of the "VEN
DORLIB" symbol, which is the name of the private
library for this package. The standard distribution
will put nothing in this directory. Vendors who dis
tribute perl may wish to place their own modules in
this directory with MakeMaker Makefile.PL
"INSTALLDIRS"=vendor or equivalent. See "INSTALL" for
details.

"vendorlib_stem"
From vendorlib.U:

This variable is $vendorlibexp with any trailing ver
sion-specific component removed. The elements in
inc_version_list (inc_version_list.U) can be tacked onto this variable to generate a list of directories
to search.

"vendorlibexp"
From vendorlib.U:

This variable is the ~name expanded version of vendor
lib, so that you may use it directly in Makefiles or
shell scripts.

"vendorprefix"
From vendorprefix.U:

This variable holds the full absolute path of the
directory below which the vendor will install add-on
packages. See "INSTALL" for usage and examples.

"vendorprefixexp"
From vendorprefix.U:

This variable holds the full absolute path of the
directory below which the vendor will install add-on
packages. Derived from vendorprefix.

"version"
From patchlevel.U:

The full version number of this package, such as 5.6.1
(or 5_6_1). This combines revision, patchlevel, and
subversion to get the full version number, including
any possible subversions. This is suitable for use as
a directory name, and hence is filesystem dependent.

"version_patchlevel_string"
From patchlevel.U:

This is a string combining version, subversion and
perl_patchlevel (if perl_patchlevel is non-zero). It
is typically something like 'version 7 subversion 1'
or 'version 7 subversion 1 patchlevel 11224' It is
computed here to avoid duplication of code in mycon_
fig.SH and lib/Config.pm.

"versiononly"
From versiononly.U:

If set, this symbol indicates that only the versionspecific components of a perl installation should be
installed. This may be useful for making a test
installation of a new version without disturbing the
existing installation. Setting versiononly is equiva
lent to setting installperl's -v option. In particu
lar, the non-versioned scripts and programs such as
a2p, c2ph, h2xs, pod2*, and perldoc are not installed
(see "INSTALL" for a more complete list). Nor are the
man pages installed. Usually, this is undef.

"vi"
From Loc.U:

This variable is defined but not used by Configure.
The value is a plain '' and is not useful.

"voidflags"
From voidflags.U:

This variable contains the eventual value of the
"VOIDFLAGS" symbol, which indicates how much support
of the void type is given by this compiler. See
"VOIDFLAGS" for more info.

x

"xlibpth"
From libpth.U:

This variable holds extra path (space-separated) used
to find libraries on this platform, for example
"CPU"-specific libraries (on multi-"CPU" platforms)
may be listed here.

"xs_apiversion"
From xs_apiversion.U:

This variable contains the version of the oldest perl
binary compatible with the present perl. perl.c:inc_ push() and lib/lib.pm will automatically search in $sitearch for older directories across major versions
back to xs_apiversion. This is only useful if you
have a perl library directory tree structured like the
default one. See "INSTALL" for how this works. The
versioned site_perl directory was introduced in 5.005,
so that is the lowest possible value. Since this can
depend on compile time options it is set by Configure.
Other non-default sources of potential incompatibil
ity, such as multiplicity, threads, debugging, 64bits,
sfio, etc., are not checked for currently, though in
principle we could go snooping around in old Config.pm files.

y

"yacc"
From yacc.U:

This variable holds the name of the compiler compiler
we want to use in the Makefile. It can be yacc, byacc,
or bison -y.

"yaccflags"
From yacc.U:

This variable contains any additional yacc flags
desired by the user. It is up to the Makefile to use
this.

z

"zcat"
From Loc.U:

This variable is defined but not used by Configure.
The value is a plain '' and is not useful.

"zip"
From Loc.U:

This variable is used internally by Configure to
determine the full pathname (if any) of the zip pro
gram. After Configure runs, the value is reset to a
plain "zip" and is not useful.

NOTE

This module contains a good example of how to use tie to
implement a cache and an example of how to make a tied
variable readonly to those outside of it.

perl v5.8.0 2002-06-01 Config(3)