=head1 NAME =for comment Generated by configpm. Any changes made here will be lost! Config - access Perl configuration information =head1 SYNOPSIS use Config; if ($Config{usethreads}) { print "has thread support\n" } use Config qw(myconfig config_sh config_vars config_re); print myconfig(); print config_sh(); print config_re(); config_vars(qw(osname archname)); =head1 DESCRIPTION The Config module contains all the information that was available to the F program at Perl build time (over 900 values). Shell variables from the F file (written by Configure) are stored in the readonly-variable C<%Config>, indexed by their names. Values stored in config.sh as 'undef' are returned as undefined values. The perl C function can be used to check if a named variable exists. For a description of the variables, please have a look at the Glossary file, as written in the Porting folder, or use the url: https://github.com/Perl/perl5/blob/blead/Porting/Glossary =over 4 =item myconfig() Returns a textual summary of the major perl configuration values. See also C<-V> in L. =item config_sh() Returns the entire perl configuration information in the form of the original config.sh shell variable assignment script. =item config_re($regex) Like config_sh() but returns, as a list, only the config entries who's names match the $regex. =item config_vars(@names) Prints to STDOUT the values of the named configuration variable. Each is printed on a separate line in the form: name='value'; Names which are unknown are output as C. See also C<-V:name> in L. =item bincompat_options() Returns a list of C pre-processor options used when compiling this F binary, which affect its binary compatibility with extensions. C and C are shown together in the output of C as I. =item non_bincompat_options() Returns a list of C pre-processor options used when compiling this F binary, which do not affect binary compatibility with extensions. =item compile_date() Returns the compile date (as a string), equivalent to what is shown by C =item local_patches() Returns a list of the names of locally applied patches, equivalent to what is shown by C. =item header_files() Returns a list of the header files that should be used as dependencies for XS code, for this version of Perl on this platform. =back =head1 EXAMPLE Here's a more sophisticated example of using %Config: use Config; use strict; my %sig_num; my @sig_name; unless($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 = $sig_name[17]\n"; if ($sig_num{ALRM}) { print "SIGALRM is $sig_num{ALRM}\n"; } =head1 WARNING Because this information is not stored within the perl executable itself it is possible (but unlikely) that the information does not relate to the actual perl binary which is being used to access it. The Config module is installed into the architecture and version specific library directory ($Config{installarchlib}) 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 C<$> and C<@> characters are replaced by C<\$> and C<\@>, respectively. This isn't foolproof, of course, so don't embed C<\$> or C<\@> in double-quoted strings unless you're willing to deal with the consequences. (The slashes will end up escaped and the C<$> or C<@> will trigger variable interpolation) =head1 GLOSSARY Most C variables are determined by the C script on platforms supported by it (which is most UNIX platforms). Some platforms have custom-made C 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 documentation in such cases. =cut =head2 _ =over 4 =item C<_a> From F: This variable defines the extension used for ordinary library files. For unix, it is F<.a>. The F<.> is included. Other possible values include F<.lib>. =item C<_exe> From F: This variable defines the extension used for executable files. C, Cygwin and F use F<.exe>. Stratus C uses F<.pm>. On operating systems which do not require a specific extension for executable files, this variable is empty. =item C<_o> From F: This variable defines the extension used for object files. For unix, it is F<.o>. The F<.> is included. Other possible values include F<.obj>. =back =head2 a =over 4 =item C From F: This variable is set to C if C (Andrew File System) is used on the system, C otherwise. It is possible to override this with a hint value or command line option, but you'd better know what you are doing. =item C From F: This variable is by default set to F. In the unlikely case this is not the correct root, it is possible to override this with a hint value or command line option. This will be used in subsequent tests for AFSness in the configure and test process. =item C From F: 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. =item C From F: This variable contains the command which can be used to compute the host name. The command is fully qualified by its absolute path, to make it safe when used by a process with super-user privileges. =item C From F: 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 F<5.6.1>, api_revision is the C<5>. Prior to 5.5.640, the format was a floating point number, like 5.00563. F:incpush() and F will automatically search in F<$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 C 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 F. C To do: Since compatibility can depend on compile 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 F. Perhaps what we ought to do is take the hard-wired value from F but then modify it if the current Configure options warrant. F then would use an #ifdef guard. =item C From F: 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 F<5.6.1>, api_subversion is the C<1>. See api_revision for full details. =item C From F: 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 F<5.6.1>, api_version is the C<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 versioned directory in $sitelib.) =item C From F: 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. =item C From F: This variable is used internally by Configure to determine the full pathname (if any) of the ar program. After Configure runs, the value is reset to a plain C and is not useful. =item C From F: 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 F. Programs using this variable must be prepared to deal with filename expansion. =item C From F: This variable is the same as the archlib variable, but is filename expanded at configuration time, for convenient use. =item C From F: This variable is a short name to characterize the current architecture. It is used mainly to construct the default archlib. =item C From F: This variable is used for the 64-bitness part of $archname. =item C From F: 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 F, for example, this would include F. =item C From F: This variable encodes the prototype of asctime_r. It is zero if d_asctime_r is undef, and one of the C macros of F if d_asctime_r is defined. =item C From F: This variable is used internally by Configure to determine the full pathname (if any) of the awk program. After Configure runs, the value is reset to a plain C and is not useful. =back =head2 b =over 4 =item C From F: The base revision level of this package, from the F<.package> file. =item C From F: This variable is defined but not used by Configure. The value is the empty string and is not useful. =item C From F: 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 F. Programs using this variable must be prepared to deal with F<~name> substitution. =item C From F: This variable saves the result from configure if generated binaries are in C format. Only set to defined when the test has actually been performed, and the result was positive. =item C From F: This is the same as the bin variable, but is filename expanded at configuration time, for use in your makefiles. =item C From F: This variable is used internally by Configure to determine the full pathname (if any) of the bison program. After Configure runs, the value is reset to a plain C and is not useful. =item C From F: This variable is used internally by Configure to determine the full pathname (if any) of the byacc program. After Configure runs, the value is reset to a plain C and is not useful. =item C From F: This variable holds the byte order in a C. 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 ! =back =head2 c =over 4 =item C From F: This variable contains the \c string if that is what causes the echo command to suppress newline. Otherwise it is null. Correct usage is $echo $n "prompt for a question: $c". =item C From F: This variable contains a flag that precise difficulties 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 argument expression list =item C From F: This variable is used internally by Configure to determine the full pathname (if any) of the cat program. After Configure runs, the value is reset to a plain C and is not useful. =item C From F: This variable holds the name of a command to execute a C compiler which can resolve multiple global references that happen to have the same name. Usual values are C and C. Fervent C compilers may be called C. C has xlc. =item C From F: This variable contains any special flags that might need to be passed with 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. =item C From F: 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. =item C From F: This variable contains any additional C compiler flags desired by the user. It is up to the Makefile to use this. =item C From F: This variable contains the compiler flags needed by large file builds and added to ccflags by hints files. =item C From F: 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 C. =item C From F: 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. =item C From F: This can set either by hints files or by Configure. If using a (non-gcc) vendor cc, this variable may contain a version for the compiler. =item C From F: Login name of the person who ran the Configure script and answered the questions. This is used to tag both F and F. =item C From F: Electronic mail address of the person who ran Configure. This can be used by units that require the user's e-mail, like F. =item C From F: Holds the output of the C command when the configuration file was produced. This is used to tag both F and F. =item C From F: This variable contains the value of the C symbol, which indicates to the C program how many bits there are in a character. =item C From F: This variable contains the value of the C symbol, which indicates to the C program how many bytes there are in a character. =item C From F: This variable is defined but not used by Configure. The value is the empty string and is not useful. =item C From F: This variable is used internally by Configure to determine the full pathname (if any) of the chmod program. After Configure runs, the value is reset to a plain C and is not useful. =item C From F: This variable is defined but not used by Configure. The value is the empty string and is not useful. =item C From F: This variable holds the type returned by times(). It can be long, or clock_t on C sites (in which case should be included). =item C From F: This variable is used internally by Configure to determine the full pathname (if any) of the comm program. After Configure runs, the value is reset to a plain C and is not useful. =item C From F: This variable holds the command to check if the file specified as a parameter contains a compiler warning =item C From F: This variable is defined but not used by Configure. The value is the empty string and is not useful. =item C From F: This variable contains the string used to invoke the Configure command, as reported by the shell in the $0 variable. =item C From F: This variable contains the number of command-line arguments passed to Configure, as reported by the shell in the $# variable. The individual arguments are stored as variables config_arg1, config_arg2, etc. =item C From F: This variable contains a single string giving the command-line arguments passed to Configure. Spaces within arguments, quotes, and escaped characters are not correctly preserved. To reconstruct the command line, you must assemble the individual command line pieces, given in config_arg[0-9]*. =item C From F: This variable holds the command to do a grep with a proper return status. On most sane systems it is simply C. On insane systems it is a grep followed by a cat followed by a test. This variable is primarily for the use of other Configure units. =item C From F: This variable is used internally by Configure to determine the full pathname (if any) of the cp program. After Configure runs, the value is reset to a plain C and is not useful. =item C From F: This variable is defined but not used by Configure. The value is the empty string and is not useful. =item C From F: This variable is used internally by Configure to determine the full pathname (if any) of the cpp program. After Configure runs, the value is reset to a plain C and is not useful. =item C From F: This variable contains an identification of the concatenation mechanism used by the C preprocessor. =item C From F: 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-separated list of symbol=value tokens. =item C From F: This variable holds the flags that will be passed to the C pre- processor. It is up to the Makefile to use it. =item C From F: This variable has the same functionality as cppminus, only it applies to cpprun and not cppstdin. =item C From F: 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 C<-> if cppstdin needs a minus to specify standard input, otherwise the value is "". =item C From F: 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 different from the one used by the C compiler. Don't forget to append cpplast after the preprocessor options. =item C From F: This variable contains the command which will invoke the C preprocessor on standard input and put the output to stdout. It is primarily used by other Configure units that ask about preprocessor symbols. =item C From F: 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 ccsymbols and cppccsymbols. The list is a space-separated list of symbol=value tokens. =item C From F: This variable encodes the prototype of crypt_r. It is zero if d_crypt_r is undef, and one of the C macros of F if d_crypt_r is defined. =item C From F: This variable holds -lcrypt or the path to a F archive if the crypt() function is not defined in the standard C library. It is up to the Makefile to use this. =item C From F: This variable is used internally by Configure to determine the full pathname (if any) of the csh program. After Configure runs, the value is reset to a plain C and is not useful. =item C From F: This variable encodes the prototype of ctermid_r. It is zero if d_ctermid_r is undef, and one of the C macros of F if d_ctermid_r is defined. =item C From F: This variable encodes the prototype of ctime_r. It is zero if d_ctime_r is undef, and one of the C macros of F if d_ctime_r is defined. =back =head2 d =over 4 =item C From F: This variable conditionally defines C if _fwalk() is available to apply a function to all the file handles. =item C From F: This variable conditionally defines HAS_ACCEPT4 if accept4() is available to accept socket connections. =item C From F: This variable conditionally defines C if the access() system call is available to check for access permissions using real IDs. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the accessx() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the acosh() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the aintl() routine is available. If copysignl is also present we can emulate modfl. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the alarm() routine is available. =item C From F: This variable conditionally defines C to hold the pathname of architecture-dependent library files for $package. If $archlib is the same as $privlib, then this is set to undef. =item C From F: This variable conditionally defines the HAS_ASCTIME64 symbol, which indicates to the C program that the asctime64 () routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the asctime_r() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the asinh() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the atanh() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the atolf() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the atoll() routine is available. =item C From F: This variable conditionally defines C, which indicates that the C compiler can know that certain functions should always be inlined. =item C From F: This variable conditionally defines C, which indicates that C can handle the attribute for marking deprecated APIs =item C From F: This variable conditionally defines C, which indicates the C compiler can check for printf-like formats. =item C From F: This variable conditionally defines C, which indicates the C compiler can understand functions as having malloc-like semantics. =item C From F: This variable conditionally defines C, which indicates that the C compiler can know that certain arguments must not be C, and will check accordingly at compile time. =item C From F: This variable conditionally defines C, which indicates that the C compiler can know that certain functions are guaranteed never to return. =item C From F: This variable conditionally defines C, which indicates that the C compiler can know that certain functions are C functions, meaning that they have no side effects, and only rely on function input F global data for their results. =item C From F: This variable conditionally defines C, which indicates that the C compiler can know that certain variables and arguments may not always be used, and to not throw warnings if they don't get used. =item C From F: This variable conditionally defines C, which indicates that the C compiler can know that certain functions have a return values that must not be ignored, such as malloc() or open(). =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the backtrace() routine is available to get a stack trace. =item C From F: This symbol conditionally defines the symbol C when running on a C system. =item C From F: This variable conditionally defines C if getpgrp needs one arguments whereas C one needs none. =item C From F: This variable conditionally defines C if setpgrp needs two arguments whereas C one needs none. See also d_setpgid for a C interface. =item C From F: This variable conditionally defines C, which indicates that the compiler supports __builtin_add_overflow(x,y,&z) for safely adding x and y into z while checking for overflow. =item C From F: This conditionally defines C, which indicates that the compiler supports __builtin_choose_expr(x,y,z). This built-in function is analogous to the C operator in C, except that the expression returned has its type unaltered by promotion rules. Also, the built-in function does not evaluate the expression that was not chosen. =item C From F: This conditionally defines C, which indicates that the compiler supports __builtin_expect(exp,c). You may use __builtin_expect to provide the compiler with branch prediction information. =item C From F: This variable conditionally defines C, which indicates that the compiler supports __builtin_mul_overflow(x,y,&z) for safely multiplying x and y into z while checking for overflow. =item C From F: This variable conditionally defines C, which indicates that the compiler supports __builtin_sub_overflow(x,y,&z) for safely subtracting y from x into z while checking for overflow. =item C From F: This variable conditionally defines the HAS_C99_VARIADIC_MACROS symbol, which indicates to the C program that C99 variadic macros are available. =item C From F: This variable conditionally defines CASTI32, which indicates whether the C compiler can cast large floats to 32-bit ints. =item C From F: This variable conditionally defines C, which indicates whether the C compiler can cast negative float to unsigned. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the cbrt() (cube root) function is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the chown() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the chroot() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the chsize() routine is available to truncate files. You might need a -lx to get this routine. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the class() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the clearenv () routine is available. =item C From F: This variable conditionally defines C if closedir() is available. =item C From F: This variable conditionally defines the C symbol, which indicates that the struct cmsghdr is supported. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the copysign() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the copysignl() routine is available. If aintl is also present we can emulate modfl. =item C From F: This variable conditionally defines the C symbol, which indicates that a C++ compiler was used to compiled Perl and will be used to compile extensions. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the crypt() routine is available to encrypt passwords and the like. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the crypt_r() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the C-shell exists. =item C From F: This variable conditionally defines C if ctermid() is available to generate filename for terminal. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the ctermid_r() routine is available. =item C From F: This variable conditionally defines the HAS_CTIME64 symbol, which indicates to the C program that the ctime64 () routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the ctime_r() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the cuserid() routine is available to get character login names. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the system provides a prototype for the dbminit() function. Otherwise, it is up to the program to supply one. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the difftime() routine is available. =item C From F: This variable conditionally defines the HAS_DIFFTIME64 symbol, which indicates to the C program that the difftime64 () routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates that the C directory stream type contains a member variable called dd_fd. =item C From F: This variable conditionally defines the C constant, which indicates to the C program that dirfd() is available to return the file descriptor of a directory stream. =item C From F: This variable conditionally defines C, which indicates to the C program that the length of directory entry names is provided by a d_namelen field. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the dladdr() routine is available to get a stack trace. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the dlerror() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the dlopen() routine is available. =item C From F: This variable conditionally defines C, which indicates that we need to prepend an underscore to the symbol name before calling dlsym(). =item C From F: This variable conditionally defines the symbol C, which tells the C program that it should insert setuid emulation code on hosts which have setuid #! scripts disabled. =item C From F: This variable conditionally defines the symbol C which indicates that the double type has an infinity. =item C From F: This variable conditionally defines the symbol C which indicates that the double type has a not-a-number. =item C From F: This variable conditionally defines the symbol C which indicates that the double type has a negative zero. =item C From F: This variable conditionally defines the symbol C which indicates that the double type has subnormals (denormals). =item C From F: This variable conditionally defines the symbol C which indicates that the double is the 64-bit C mainframe format. =item C From F: This variable conditionally defines the symbol C, which indicates that the double is the 64-bit C mainframe format. =item C From F: This variable conditionally defines the symbol C, which indicates that the double is the 64-bit C 754. =item C From F: This variable conditionally defines the symbol C, which indicates that the double is the 64-bit C format D or G. =item C From F: This variable conditionally defines the HAS_DRAND48_R symbol, which indicates to the C program that the drand48_r() routine is available. =item C From F: 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 program to supply one. =item C From F: This variable conditionally defines HAS_DUP2 if dup2() is available to duplicate file descriptors. =item C From F: This variable conditionally defines HAS_DUP3 if dup3() is available to duplicate file descriptors. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the duplocale() routine is available to duplicate a locale object. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the eaccess() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the endgrent() routine is available for sequential access of the group database. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the endgrent_r() routine is available. =item C From F: This variable conditionally defines C if endhostent() is available to close whatever was being used for host queries. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the endhostent_r() routine is available. =item C From F: This variable conditionally defines C if endnetent() is available to close whatever was being used for network queries. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the endnetent_r() routine is available. =item C From F: This variable conditionally defines C if endprotoent() is available to close whatever was being used for protocol queries. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the endprotoent_r() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the endpwent() routine is available for sequential access of the passwd database. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the endpwent_r() routine is available. =item C From F: This variable conditionally defines C if endservent() is available to close whatever was being used for service queries. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the endservent_r() routine is available. =item C From F: This variable conditionally defines C if C can be seen when reading from a non-blocking I/O source. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the erf() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the erfc() routine is available. =item C From F: This variable conditionally defines the symbols C and C, which alerts the C program that it must deal with idiosyncrasies of C. =item C From F: This variable conditionally defines the HAS_EXP2 symbol, which indicates to the C program that the exp2() routine is available. =item C From F: This variable conditionally defines the HAS_EXPM1 symbol, which indicates to the C program that the expm1() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the "fast stdio" is available to manipulate the stdio buffers directly. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the fchdir() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the fchmod() routine is available to change mode of opened files. =item C From F: This variable conditionally defines the C symbol, which indicates the C fchmodat() function is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the fchown() routine is available to change ownership of opened files. =item C From F: This variable conditionally defines the C symbol, and indicates whether the fcntl() function exists =item C From F: This variable conditionally defines the C symbol and indicates whether file locking with fcntl() works. =item C From F: This variable contains the eventual value of the C symbol, which indicates if your C compiler knows about the macros which manipulate an fd_set. =item C From F: This variable contains the eventual value of the C symbol, which indicates if your C compiler knows about the fd_set typedef. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the fdclose() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the fdim() routine is available. =item C From F: This variable contains the eventual value of the C 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, C will let us know how to fix the gaffe. =item C From F: This variable conditionally defines C if fegetround() is available to get the floating point rounding mode. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the ffs() routine is available to find the first bit which is set in its integer argument. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the ffsl() routine is available to find the first bit which is set in its long integer argument. =item C From F: This variable conditionally defines C if fgetpos() is available to get the file position indicator. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the finite() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the finitel() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates that the system supports filenames longer than 14 characters. =item C From F: This variable conditionally defines C if flock() is available to do file locking. =item C From F: This variable conditionally defines the C 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. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the fma() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the fmax() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the fmin() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the fork() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the fp_class() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the fp_classify() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the fp_classl() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the pathconf() routine is available to determine file-system related limits and options associated with a given open file descriptor. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the fpclass() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the fpclassify() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the fpclassl() routine is available. =item C From F: This variable conditionally defines C if fpgetround() is available to get the floating point rounding mode. =item C From F: This symbol will be defined if the C compiler supports fpos64_t. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the freelocale() routine is available to deallocates the resources associated with a locale object. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the frexpl() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates that the struct fs_data is supported. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the fseeko() routine is available. =item C From F: This variable conditionally defines C if fsetpos() is available to set the file position indicator. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the fstatfs() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the fstatvfs() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the fsync() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the ftello() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates that the ftime() routine exists. The ftime() routine is basically a sub-second accuracy clock. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the futimes() routine is available. =item C From F: This variable conditionally defines the C symbol if the gai_strerror() routine is available and can be used to translate error codes returned by getaddrinfo() into human readable strings. =item C From F: This variable holds what Gconvert is defined as to convert floating point numbers into strings. By default, Configure sets C macro to use the first of gconvert, gcvt, or sprintf that pass sprintf-%g-like behavior tests. If perl is using long doubles, the macro uses the first of the following 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 function 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 F call-back unit so that long doubles can be formatted without loss of precision. =item C From F: This variable conditionally defines the C symbol, which indicates that the gdbm-F include file uses real C C prototypes instead of K&R style function declarations. K&R style declarations are unsupported in C++, so the include file requires special handling when using a C++ compiler and this variable is undefined. Consult the different d_*ndbm_h_uses_prototypes variables to get the same information for alternative F include files. =item C From F: This variable conditionally defines the C symbol, which indicates that the F include file uses real C C prototypes instead of K&R style function declarations. K&R style declarations are unsupported in C++, so the include file requires special handling when using a C++ compiler and this variable is undefined. Consult the different d_*ndbm_h_uses_prototypes variables to get the same information for alternative F include files. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the getaddrinfo() function is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the getcwd() routine is available to get the current working directory. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the getenv() system call does not zap the static buffer in a different thread. =item C From F: This variable conditionally defines C if getespwnam() is available to retrieve enhanced (shadow) password entries by name. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the getfsstat() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the getgrent() routine is available for sequential access of the group database. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the getgrent_r() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the getgrgid_r() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the getgrnam_r() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the getgroups() routine is available to get the list of process groups. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the gethostbyaddr() routine is available to look up hosts by their C addresses. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the gethostbyname() routine is available to look up host names in some data base or other. =item C From F: This variable conditionally defines C if gethostent() is available to look up host names in some data base or another. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the gethostname() routine may be used to derive the host name. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the gethostbyaddr_r() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the gethostbyname_r() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the gethostent_r() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that supplies prototypes for the various gethost*() functions. See also F for probing for various netdb types. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the getitimer() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the getlogin() routine is available to get the login name. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the getlogin_r() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the getmnt() routine is available to retrieve one or more mount info blocks by filename. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the getmntent() routine is available to iterate through mounted files to get their mount info. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the getnameinfo() function is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the getnetbyaddr() routine is available to look up networks by their C addresses. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the getnetbyname() routine is available to look up networks by their names. =item C From F: This variable conditionally defines C if getnetent() is available to look up network names in some data base or another. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the getnetbyaddr_r() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the getnetbyname_r() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the getnetent_r() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that supplies prototypes for the various getnet*() functions. See also F for probing for various netdb types. =item C From F: This variable conditionally defines C if getpagesize() is available to get the system page size. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the getprotobyname() routine is available to look up protocols by their name. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the getprotobynumber() routine is available to look up protocols by their number. =item C From F: This variable conditionally defines C if getprotoent() is available to look up protocols in some data base or another. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the getpgid(pid) function is available to get the process group id. =item C From F: This variable conditionally defines C if getpgrp() is available to get the current process group. =item C From F: This variable conditionally defines the HAS_GETPGRP2 symbol, which indicates to the C program that the getpgrp2() (as in F>) routine is available to get the current process group. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the getppid() routine is available to get the parent process C. =item C From F: This variable conditionally defines C if getpriority() is available to get a process's priority. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the getprotobyname_r() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the getprotobynumber_r() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the getprotoent_r() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that supplies prototypes for the various getproto*() functions. See also F for probing for various netdb types. =item C From F: This variable conditionally defines C if getprpwnam() is available to retrieve protected (shadow) password entries by name. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the getpwent() routine is available for sequential access of the passwd database. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the getpwent_r() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the getpwnam_r() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the getpwuid_r() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the getservbyname() routine is available to look up services by their name. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the getservbyport() routine is available to look up services by their port. =item C From F: This variable conditionally defines C if getservent() is available to look up network services in some data base or another. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the getservbyname_r() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the getservbyport_r() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the getservent_r() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that supplies prototypes for the various getserv*() functions. See also F for probing for various netdb types. =item C From F: This variable conditionally defines C if getspnam() is available to retrieve SysV shadow password entries by name. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the getspnam_r() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates that the gettimeofday() system call exists (to obtain a sub-second accuracy clock). You should probably include . =item C From F: This variable conditionally defines the HAS_GMTIME64 symbol, which indicates to the C program that the gmtime64 () routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the gmtime_r() routine is available. =item C From F: Defined if we're dealing with the C C Library. =item C From F: This variable conditionally defines C, which indicates that struct group in contains gr_passwd. =item C From F: This variable is set to either C or C depending on whether the compilation system supports the F-8 locale. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the hasmntopt() routine is available to query the mount options of file systems. =item C From F: This variable conditionally defines C if htonl() and its friends are available to do network order byte swapping. =item C From F: This variable conditionally defines C if hypot is available for numerically stable hypotenuse function. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the ilogb() routine is available for extracting the exponent of double x as a signed integer. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the ilogbl() routine is available for extracting the exponent of long double x as a signed integer. If scalbnl is also present we can emulate frexpl. =item C From F: This variable conditionally defines C. It is set to undef when C is empty. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the inet_aton() function is available to parse C address C strings. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the inet_ntop() function is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the inet_pton() function is available. =item C From F: This symbol will be defined if the C compiler supports int64_t. =item C From F: This variable conditionally defines the C symbol, which indicates the availability of a struct ip_mreq. =item C From F: This variable conditionally defines the C symbol, which indicates the availability of a struct ip_mreq_source. =item C From F: This variable conditionally defines the HAS_IPV6_MREQ symbol, which indicates the availability of a struct ipv6_mreq. =item C From F: This variable conditionally defines the HAS_IPV6_MREQ_SOURCE symbol, which indicates the availability of a struct ipv6_mreq_source. =item C From F: This variable conditionally defines the C constant, which indicates to the C program that isascii() is available. =item C From F: This variable conditionally defines the C constant, which indicates to the C program that isblank() is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the isfinite() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the isfinitel() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the isinf() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the isinfl() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the isless() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the isnan() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the isnanl() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the isnormal() routine is available. =item C From F: This variable conditionally defines the HAS_J0 symbol, which indicates to the C program that the j0() routine is available. =item C From F: This variable conditionally defines the HAS_J0L symbol, which indicates to the C program that the j0l() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the killpg() routine is available to kill process groups. =item C From F: This variable conditionally defines HAS_LC_MONETARY_2008 if libc has the international currency locale rules from C 1003.1-2008. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the lchown() routine is available to operate on a symbolic link (instead of following the link). =item C From F: This variable conditionally defines d_ldbl_dig if this system's header files provide C, which is the number of significant digits in a long double precision number. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the ldexpl() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the lgamma() routine is available for the log gamma function. See also d_tgamma and d_lgamma_r. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the lgamma_r() routine is available for the log gamma function, without using the global signgam variable. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that F defines C<_LIB_VERSION> being available in libm =item C From F: This variable is defined if the target system insists on unique basenames for shared library files. This is currently true on Android, false everywhere else we know of. Defaults to C. =item C From F: This variable conditionally defines C if link() is available to create hard links. =item C From F: This variable conditionally defines the C symbol, which indicates the C linkat() function is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the llrint() routine is available to return the long long value closest to a double (according to the current rounding mode). =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the llrintl() routine is available to return the long long value closest to a long double (according to the current rounding mode). =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the llround() routine is available to return the long long value nearest to x. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the llroundl() routine is available to return the long long value nearest to x away from zero. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the localeconv_l() routine is available. =item C From F: This variable conditionally defines the HAS_LOCALTIME64 symbol, which indicates to the C program that the localtime64 () routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the localtime_r() routine is available. =item C From F: This variable conditionally defines the C symbol, which makes us call tzset before localtime_r() =item C From F: This variable conditionally defines C if localeconv() is available for numeric and monetary formatting conventions. =item C From F: This variable conditionally defines C if lockf() is available to do file locking. =item C From F: This variable conditionally defines the HAS_LOG1P symbol, which indicates to the C program that the logp1() routine is available to compute log(1 + x) for values of x close to zero. =item C From F: This variable conditionally defines the HAS_LOG2 symbol, which indicates to the C program that the log2() routine is available to compute log base two. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the logb() routine is available to extract the exponent of x. =item C From F: This variable conditionally defines C if the long double is any of the C 754 style long doubles: C, C, C. =item C From F: This variable conditionally defines C if the long double is the 128-bit C 754 double-double. =item C From F: This variable conditionally defines C if the long double is the 80-bit C 754 extended precision. Note that despite the C this is less than the C, since this is an extension of the double precision. =item C From F: This variable conditionally defines C if the long double is the 128-bit C 754. =item C From F: This variable conditionally defines C if the long double is the 128-bit C format H. =item C From F: This variable conditionally defines C if the long double type is supported. =item C From F: This variable conditionally defines C if the long long type is supported. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the lrint() routine is available to return the integral value closest to a double (according to the current rounding mode). =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the lrintl() routine is available to return the integral value closest to a long double (according to the current rounding mode). =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the lround() routine is available to return the integral value nearest to x. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the lroundl() routine is available to return the integral value nearest to x away from zero. =item C From F: This variable conditionally defines the C 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. =item C From F: This variable conditionally defines C if lstat() is available to do file stats on symbolic links. =item C From F: This variable conditionally defines C if madvise() is available to map a file into memory. =item C From F: This symbol, if defined, indicates that the malloc_good_size routine is available for use. =item C From F: This symbol, if defined, indicates that the malloc_size routine is available for use. =item C From F: This symbol, if defined, indicates that the malloc_usable_size routine is available for use. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the mblen() routine is available to find the number of bytes in a multibyte character. =item C From F: This variable conditionally defines the C symbol if the mbrlen() routine is available to be used to get the length of multi-byte character strings. =item C From F: This variable conditionally defines the C symbol if the mbrtowc() routine is available to be used to convert a multi-byte character into a wide character. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the mbstowcs() routine is available to convert a multibyte string into a wide character string. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the mbtowc() routine is available to convert multibyte to a wide character. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the memmem() routine is available to return a pointer to the start of the first occurrence of a substring in a memory area (or C if not found). =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the memrchr() routine is available to return a pointer to the last occurrence of a byte in a memory area (or C if not found). =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the mkdir() routine is available to create F. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the mkdtemp() routine is available to exclusively create a uniquely named temporary directory. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the mkfifo() routine is available. =item C From F: This variable conditionally defines C if mkostemp() is available to exclusively create and open a uniquely named (with a suffix) temporary file. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the mkstemp() routine is available to exclusively create and open a uniquely named temporary file. =item C From F: This variable conditionally defines the C 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. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the mktime() routine is available. =item C From F: This variable conditionally defines the HAS_MKTIME64 symbol, which indicates to the C program that the mktime64 () routine is available. =item C From F: This variable conditionally defines C if mmap() is available to map a file into memory. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the modfl() routine is available. =item C From F: This symbol, if defined, indicates that the system provides a prototype for the modfl() function. Otherwise, it is up to the program to supply one. C99 says it should be long double modfl(long double, long double *); =item C From F: This variable conditionally defines C if mprotect() is available to modify the access protection of a memory mapped file. =item C From F: This variable conditionally defines the C symbol, which indicates that the entire msg*(2) library is present. =item C From F: This variable conditionally defines the C symbol, which indicates that the C is available. #ifdef is not enough because it may be an enum, glibc has been known to do this. =item C From F: This variable conditionally defines the C symbol, which indicates that the C is available. #ifdef is not enough because it may be an enum, glibc has been known to do this. =item C From F: This variable conditionally defines the C symbol, which indicates that the C is available. #ifdef is not enough because it may be an enum, glibc has been known to do this. =item C From F: This variable conditionally defines the C symbol, which indicates that the C is available. #ifdef is not enough because it may be an enum, glibc has been known to do this. =item C From F: This variable conditionally defines the C symbol, which indicates that the C is available. #ifdef is not enough because it may be an enum, glibc has been known to do this. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the msgctl() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the msgget() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates that the struct msghdr is supported. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the msgrcv() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the msgsnd() routine is available. =item C From F: This variable conditionally defines C if msync() is available to synchronize a mapped file. =item C From F: This variable conditionally defines C if munmap() is available to unmap a region mapped by mmap(). =item C From F: This variable conditionally defines C in case other parts of the source want to take special action if C is used. This may include different sorts of profiling or error detection. =item C From F: This variable conditionally defines C if nan() is available to generate NaN. =item C From F: This variable conditionally defines C if nanosleep() is available to sleep with 1E-9 sec accuracy. =item C From F: This variable conditionally defines the C symbol, which indicates that both the F include file and an appropriate ndbm library exist. Consult the different i_*ndbm variables to find out the actual include location. Sometimes, a system has the header file but not the library. This variable will only be set if the system has both. =item C From F: This variable conditionally defines the C symbol, which indicates that the F include file uses real C C prototypes instead of K&R style function declarations. K&R style declarations are unsupported in C++, so the include file requires special handling when using a C++ compiler and this variable is undefined. Consult the different d_*ndbm_h_uses_prototypes variables to get the same information for alternative F include files. =item C From F: This variable conditionally defines C if nearbyint() is available to return the integral value closest to (according to the current rounding mode) to x. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the newlocale() routine is available to return a new locale object or modify an existing locale object. =item C From F: This variable conditionally defines C if nextafter() is available to return the next machine representable double from x in direction y. =item C From F: This variable conditionally defines C if nexttoward() is available to return the next machine representable long double from x in direction y. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the nice() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the nl_langinfo() routine is available. =item C From F: This variable contains the eventual value of the C symbol, which indicates if the nl_langinfo_l() function exists. =item C From F: This variable conditionally defines C which indicates that the C compiler accepts struct bitfields of sizes that aren't C or C =item C From F: This variable indicates whether a variable of type nvtype can preserve all the bits a variable of type uvtype. =item C From F: This variable indicates whether a variable of type nvtype stores 0.0 in memory as all bits zero. =item C From F: This symbol will be defined if the C compiler supports off64_t. =item C From F: This variable conditionally defines pthread_create_joinable. undef if F defines C. =item C From F: This variable conditionally defines the C symbol, and indicates that Perl should be built to use the old draft C threads C. This is only potentially meaningful if usethreads is set. =item C From F: This variable conditionally defines the C symbol, which indicates that the C socket interface is based on 4.1c and not 4.2. =item C From F: This variable conditionally defines the HAS_OPEN3 manifest constant, which indicates to the C program that the 3 argument version of the open(2) function is available. =item C From F: This variable conditionally defines the C symbol, which indicates the C openat() function is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the pathconf() routine is available to determine file-system related limits and options associated with a given filename. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the pause() routine is available to suspend a process until a signal is received. =item C From F: This variable conditionally defines C, which contains a colon-separated set of paths for the perl binary to include in @C. See also otherlibdirs. =item C From F: This variable conditionally defines the C symbol, which contains the shell command which, when fed to popen(), may be used to derive the host name. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the pipe() routine is available to create an inter-process channel. =item C From F: This variable conditionally defines the HAS_PIPE2 symbol, which indicates to the C program that the pipe2() routine is available to create an inter-process channel. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the poll() routine is available to poll active file descriptors. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that it should not assume that it is running on the machine it was compiled on. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the prctl() routine is available. Note that there are at least two prctl variants: Linux and Irix. While they are somewhat similar, they are incompatible. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the prctl() routine supports the C option. =item C From F: This variable conditionally defines the PERL_PRId64 symbol, which indicates that stdio has a symbol to print 64-bit decimal numbers. =item C From F: This variable conditionally defines the PERL_PRIfldbl symbol, which indicates that stdio has a symbol to print long doubles. =item C From F: This variable conditionally defines the PERL_PRIfldbl symbol, which indicates that stdio has a symbol to print long doubles. The C in the name is to separate this from d_PRIeldbl so that even case-blind systems can see the difference. =item C From F: This variable conditionally defines the PERL_PRIfldbl symbol, which indicates that stdio has a symbol to print long doubles. =item C From F: This variable conditionally defines the PERL_PRIfldbl symbol, which indicates that stdio has a symbol to print long doubles. The C in the name is to separate this from d_PRIfldbl so that even case-blind systems can see the difference. =item C From F: This variable conditionally defines the PERL_PRIfldbl symbol, which indicates that stdio has a symbol to print long doubles. =item C From F: This variable conditionally defines the PERL_PRIfldbl symbol, which indicates that stdio has a symbol to print long doubles. The C in the name is to separate this from d_PRIgldbl so that even case-blind systems can see the difference. =item C From F: This variable conditionally defines the PERL_PRIi64 symbol, which indicates that stdio has a symbol to print 64-bit decimal numbers. =item C From F: This variable conditionally defines C, which indicates the C compiler allows printf-like formats to be null. =item C From F: This variable conditionally defines the PERL_PRIo64 symbol, which indicates that stdio has a symbol to print 64-bit octal numbers. =item C From F: This variable conditionally defines the PERL_PRIu64 symbol, which indicates that stdio has a symbol to print 64-bit unsigned decimal numbers. =item C From F: This variable conditionally defines the PERL_PRIx64 symbol, which indicates that stdio has a symbol to print 64-bit hexadecimal numbers. =item C From F: This variable conditionally defines the PERL_PRIXU64 symbol, which indicates that stdio has a symbol to print 64-bit hExADECimAl numbers. The C in the name is to separate this from d_PRIx64 so that even case-blind systems can see the difference. =item C From F: Defined if $procselfexe is symlink to the absolute pathname of the executing program. =item C From F: This variable conditionally defines the C symbol, which indicates that an emulation of the fork routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the pthread_atfork() routine is available. =item C From F: This variable conditionally defines C if pthread_attr_setscope() is available to set the contention scope attribute of a thread attribute object. =item C From F: This variable conditionally defines the C symbol if the pthread_yield routine is available to yield the execution of the current thread. =item C From F: This symbol will be defined if the C compiler supports ptrdiff_t. =item C From F: This variable conditionally defines C, which indicates that struct passwd contains pw_age. =item C From F: This variable conditionally defines C, which indicates that struct passwd contains pw_change. =item C From F: This variable conditionally defines C, which indicates that struct passwd contains pw_class. =item C From F: This variable conditionally defines C, which indicates that struct passwd contains pw_comment. =item C From F: This variable conditionally defines C, which indicates that struct passwd contains pw_expire. =item C From F: This variable conditionally defines C, which indicates that struct passwd contains pw_gecos. =item C From F: This variable conditionally defines C, which indicates that struct passwd contains pw_passwd. =item C From F: This variable conditionally defines C, which indicates that struct passwd contains pw_quota. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the qgcvt() routine is available. =item C From F: This variable, if defined, tells that there's a 64-bit integer type, quadtype. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the querylocale() routine is available to return the name of the locale for a category mask. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the random_r() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the re_comp() routine is available for regular pattern matching (usually on C). If so, it is likely that re_exec() exists. =item C From F: This variable conditionally defines C if readdir() is available to read directory entries. =item C From F: This variable conditionally defines the HAS_READDIR64_R symbol, which indicates to the C program that the readdir64_r() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the readdir_r() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the readlink() routine is available to read the value of a symbolic link. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the readv() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the recvmsg() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the regcmp() routine is available for regular pattern matching (usually on System V). =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the regcomp() routine is available for regular pattern matching (usually on F conforming systems). =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the remainder() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the remquo() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the rename() routine is available to rename files. =item C From F: This variable conditionally defines the C symbol, which indicates the C renameat() function is available. =item C From F: This variable conditionally defines C if rewinddir() is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the rint() routine is available. =item C From F: This variable conditionally defines C if rmdir() is available to remove directories. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the round() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the system provides a prototype for the sbrk() function. Otherwise, it is up to the program to supply one. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the scalbn() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the scalbnl() routine is available. If ilogbl is also present we can emulate frexpl. =item C From F: This variable conditionally defines the C symbol if the sched_yield routine is available to yield the execution of the current thread. =item C From F: This variable conditionally defines the C symbol, which indicates that the C is available. #ifdef is not enough because it may be an enum, glibc has been known to do this. =item C From F: This variable conditionally defines the PERL_PRIfldbl symbol, which indicates that stdio has a symbol to scan long doubles. =item C From F: This variable conditionally defines C if seekdir() is available. =item C From F: This variable conditionally defines C if select() is available to select active file descriptors. A inclusion may be necessary for the timeout field. =item C From F: This variable conditionally defines the C symbol, which indicates that the entire sem*(2) library is present. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the semctl() routine is available. =item C From F: This variable conditionally defines C, which indicates that struct semid_ds * is to be used for semctl C. =item C From F: This variable conditionally defines C, which indicates that union semun is to be used for semctl C. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the semget() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the semop() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the sendmsg() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the setegid() routine is available to change the effective gid of the current program. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the seteuid() routine is available to change the effective uid of the current program. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the setgrent() routine is available for initializing sequential access to the group database. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the setgrent_r() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the setgroups() routine is available to set the list of process groups. =item C From F: This variable conditionally defines C if sethostent() is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the sethostent_r() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the setitimer() routine is available. =item C From F: This variable conditionally defines the C 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 line-buffered mode. =item C From F: This variable conditionally defines C if setlocale() is available to handle locale-specific ctype implementations. =item C From F: This variable conditionally defines C if setlocale() accepts any locale name. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the setlocale_r() routine is available. =item C From F: This variable conditionally defines C if setnetent() is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the setnetent_r() routine is available. =item C From F: This variable conditionally defines C if setprotoent() is available. =item C From F: This variable conditionally defines the C symbol if the setpgid(pid, gpid) function is available to set process group C. =item C From F: This variable conditionally defines C if setpgrp() is available to set the current process group. =item C From F: This variable conditionally defines the HAS_SETPGRP2 symbol, which indicates to the C program that the setpgrp2() (as in F>) routine is available to set the current process group. =item C From F: This variable conditionally defines C if setpriority() is available to set a process's priority. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the setproctitle() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the setprotoent_r() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the setpwent() routine is available for initializing sequential access to the passwd database. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the setpwent_r() routine is available. =item C From F: This variable conditionally defines C if setregid() is available to change the real and effective gid of the current process. =item C From F: This variable conditionally defines C if setresgid() is available to change the real, effective and saved gid of the current process. =item C From F: This variable conditionally defines C if setresuid() is available to change the real, effective and saved uid of the current process. =item C From F: This variable conditionally defines C if setreuid() is available to change the real and effective uid of the current process. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the setrgid() routine is available to change the real gid of the current program. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the setruid() routine is available to change the real uid of the current program. =item C From F: This variable conditionally defines C if setservent() is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the setservent_r() routine is available. =item C From F: This variable conditionally defines C if setsid() is available to set the process group C. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the setvbuf() routine is available to change buffering on an open stdio stream. =item C From F: This variable conditionally defines the C symbol, which indicates that the entire shm*(2) library is present. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the shmat() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates that F has a prototype for shmat. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the shmctl() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the shmdt() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the shmget() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates that the Vr4 sigaction() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates that the siginfo_t struct has the si_addr member. =item C From F: This variable conditionally defines the C symbol, which indicates that the siginfo_t struct has the si_band member. =item C From F: This variable conditionally defines the C symbol, which indicates that the siginfo_t struct has the si_errno member. =item C From F: This variable conditionally defines the C symbol, which indicates that the siginfo_t struct has the si_fd member. =item C From F: This variable conditionally defines the C symbol, which indicates that the siginfo_t struct has the si_pid member. =item C From F: This variable conditionally defines the C symbol, which indicates that the siginfo_t struct has the si_status member. =item C From F: This variable conditionally defines the C symbol, which indicates that the siginfo_t struct has the si_uid member. =item C From F: This variable conditionally defines the C symbol, which indicates that the siginfo_t struct has the si_value member. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the signbit() routine is available and safe to use with perl's intern C type. =item C From F: This variable conditionally defines C if sigprocmask() is available to examine or change the signal mask of the calling process. =item C From F: This variable conditionally defines the C symbol, which indicates that the sigsetjmp() routine is available to call setjmp() and optionally save the process's signal mask. =item C From F: This variable conditionally defines the HAS_SIN6_SCOPE_ID symbol, which indicates that a struct sockaddr_in6 structure has the sin6_scope_id member. =item C From F: This variable conditionally defines C to hold the pathname of architecture-dependent library files for $package. If $sitearch is the same as $archlib, then this is set to undef. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the snprintf () library function is available. =item C From F: This variable conditionally defines the HAS_SOCKADDR_IN6 symbol, which indicates the availability of a struct sockaddr_in6. =item C From F: This variable conditionally defines the C symbol, which indicates that a struct sockaddr structure has the sa_len member. =item C From F: This variable conditionally defines the C symbol, which indicates the availability of a struct sockaddr_storage. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the sockatmark() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the system provides a prototype for the sockatmark() function. Otherwise, it is up to the program to supply one. =item C From F: This variable conditionally defines C, which indicates that the C socket interface is supported. =item C From F: This symbol will be defined if the C compiler supports socklen_t. =item C From F: This variable conditionally defines the C symbol, which indicates that the C socketpair() is supported. =item C From F: This variable conditionally defines the HAS_SOCKS5_INIT symbol, which indicates to the C program that the socks5_init() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the sqrtl() routine is available. =item C From F: This variable conditionally defines the HAS_SRAND48_R symbol, which indicates to the C program that the srand48_r() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the srandom_r() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the system provides a prototype for the setresgid() function. Otherwise, it is up to the program to supply one. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the system provides a prototype for the setresuid() function. Otherwise, it is up to the program to supply one. =item C From F: This variable conditionally defines C if stat() is available to get file status. =item C From F: This variable conditionally defines C if this system has a stat structure declaring st_blksize and st_blocks. =item C From F: This variable conditionally defines the C symbol, which indicates to struct statfs from has f_flags member. This kind of struct statfs is coming from F (C), not from F (C). =item C From F: This variable conditionally defines the C symbol, which indicates that the struct statfs is supported. =item C From F: This variable conditionally defines the C symbol, which indicates that the C compiler supports C99-style static inline. That is, the function can't be called from another translation unit. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the statvfs() routine is available. =item C From F: This variable conditionally defines C if the C macro can be used as an lvalue. =item C From F: This variable conditionally defines C if the C macro can be used as an lvalue. =item C From F: This symbol is defined if using the C macro as an lvalue to increase the pointer by n leaves File_cnt(fp) unchanged. =item C From F: This symbol is defined if using the C macro as an lvalue to increase the pointer by n has the side effect of decreasing the value of File_cnt(fp) by n. =item C From F: This variable tells whether there is an array holding the stdio streams. =item C From F: This variable conditionally defines C if this system has a C structure declaring a usable _base field (or equivalent) in F. =item C From F: This variable conditionally defines C if this system has a C structure declaring usable _ptr and _cnt fields (or equivalent) in F. =item C From F: This variable conditionally defines C if strcoll() is available to compare strings using collating information. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the strerror_l() routine is available to return the error message for a given errno value in a particular locale (identified by a locale_t object). =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the strerror_r() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the strftime() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the strlcat () routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the strlcpy () routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the strnlen () routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the strtod() routine is available to provide better numeric string conversion than atof(). =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the strtod_l() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the strtol() routine is available to provide better numeric string conversion than atoi() and friends. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the strtold() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the strtold_l() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the strtoll() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the strtoq() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the strtoul() routine is available to provide conversion of strings to unsigned long. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the strtoull() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the strtouq() routine is available. =item C From F: This variable conditionally defines C if strxfrm() is available to transform strings. =item C From F: This variable conditionally defines C if strxfrm_l() is available to transform strings. =item C From F: This variable conditionally defines C if setuid scripts can be secure. This test looks in F. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the symlink() routine is available to create symbolic links. =item C From F: This variable conditionally defines C if syscall() is available call arbitrary system calls. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the system provides a prototype for the syscall() function. Otherwise, it is up to the program to supply one. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the sysconf() routine is available to determine system related limits and options. =item C From F: This variable conditionally defines C if sys_errnolist[] is available to translate error numbers to the symbolic name. =item C From F: This variable conditionally defines C if sys_errlist[] is available to translate error numbers to strings. =item C From F: This variable conditionally defines C if system() is available to issue a shell command. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the tcgetpgrp() routine is available. to get foreground process group C. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the tcsetpgrp() routine is available to set foreground process group C. =item C From F: This variable conditionally defines C if telldir() is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the system provides a prototype for the telldir() function. Otherwise, it is up to the program to supply one. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the tgamma() routine is available for the gamma function. See also d_lgamma. =item C From F: This variable conditionally defines the C symbol. In turn that gives a linkage specification for thread-local storage. =item C From F: This variable contains the eventual value of the C symbol, which indicates if the nl_langinfo_l() function exists and is thread-safe. =item C From F: This variable conditionally defines the C symbol, which indicates that the time() routine exists. The time() routine is normally provided on C systems. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the timegm () routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates that the times() routine exists. The times() routine is normally provided on C systems. You may have to include . =item C From F: This variable conditionally defines C, which indicates to the C program that the struct tm has the tm_gmtoff field. =item C From F: This variable conditionally defines C, which indicates to the C program that the struct tm has the tm_zone field. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the tmpnam_r() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the towlower() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the towupper() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the trunc() routine is available to round doubles towards zero. =item C From F: This variable conditionally defines C if truncate() is available to truncate files. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the truncl() routine is available to round long doubles towards zero. If copysignl is also present, we can emulate modfl. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the ttyname_r() routine is available. =item C From F: This variable conditionally defines C if tzname[] is available to access timezone names. =item C From F: This variable tells whether you must access character data through U32-aligned pointers. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the ualarm() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the umask() routine is available. to set and get the value of the file creation mask. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the uname() routine may be used to derive the host name. =item C From F: This variable conditionally defines C if the union semun is defined by including . =item C From F: This variable conditionally defines the C symbol, which indicates the C unlinkat() function isavailable. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the unordered() routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the unsetenv () routine is available. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the uselocale() routine is available to set the current locale for the calling thread. =item C From F: This variable conditionally defines C if usleep() is available to do high granularity sleeps. =item C From F: This variable conditionally defines the C 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. =item C From F: This variable conditionally defines C if ustat() is available to query file system statistics by dev_t. =item C From F: This variable conditionally defined C. =item C From F: This variable conditionally defines C. =item C From F: This variable conditionally defines C. =item C From F: This variable conditionally defines C. =item C From F: This variable conditionally defines the C symbol, which indicates the vfork() routine is available. =item C From F: This variable conditionally defines C if closedir() does not return a value. =item C From F: This variable conditionally defines C if this system declares "void (*signal(...))()" in F. The old way was to declare it as "int (*signal(...))()". =item C From F: This variable conditionally defines C to indicate that the ioctl() call with C should be used to void tty association. Otherwise (on C probably), it is enough to close the standard file descriptors and do a setpgrp(). =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the vsnprintf () library function is available. =item C From F: This variable conditionally defines the HAS_WAIT4 symbol, which indicates the wait4() routine is available. =item C From F: This variable conditionally defines C if waitpid() is available to wait for child process. =item C From F: This variable conditionally defines the C symbol if the wcrtomb() routine is available to be used to convert a wide character into a multi-byte character. =item C From F: This variable conditionally defines the C symbol if the wcscmp() routine is available and can be used to compare wide character strings. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the wcstombs() routine is available to convert wide character strings to multibyte strings. =item C From F: This variable conditionally defines the C symbol if the wcsxfrm() routine is available and can be used to compare wide character strings. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the wctomb() routine is available to convert a wide character to a multibyte. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the writev() routine is available. =item C From F: This variable conditionally defines the symbol C, which alerts the C program that it runs under Xenix. =item C From F: This variable is used internally by Configure to determine the full pathname (if any) of the date program. After Configure runs, the value is reset to a plain C and is not useful. =item C From F: This variable contains the type of the hash structure element in the header file. In older versions of C, it was int, while in newer ones it is u_int32_t. =item C From F: This variable contains the type of the prefix structure element in the header file. In older versions of C, it was int, while in newer ones it is size_t. =item C From F: This variable contains the major version number of Berkeley C found in the header file. =item C From F: This variable contains the minor version number of Berkeley C found in the header file. For C version 1 this is always 0. =item C From F: This variable contains the patch version number of Berkeley C found in the header file. For C version 1 this is always 0. =item C From F: When defined, remove the legacy F<.> from @C =item C From F: This symbol is set to C or C depending on whether dirent is available or not. You should use this pseudo type to portably declare your directory entries. =item C From F: This variable contains the extension that is to be used for the dynamically loaded modules that perl generates. =item C From F: This variable contains the name of the dynamic loading file that will be used with the package. =item C From F: This variable contains comma-separated list of hexadecimal bytes for the double precision infinity. =item C From F: This variable, if defined, encodes the type of a double: 1 = C 754 32-bit little endian, 2 = C 754 32-bit big endian, 3 = C 754 64-bit little endian, 4 = C 754 64-bit big endian, 5 = C 754 128-bit little endian, 6 = C 754 128-bit big endian, 7 = C 754 64-bit mixed endian le-be, 8 = C 754 64-bit mixed endian be-le, 9 = C 32bit little endian F float format 10 = C 64bit little endian D float format 11 = C 64bit little endian G float format 12 = C 32bit format 13 = C 64bit format 14 = Cray 64bit format -1 = unknown format. =item C From F: This symbol, if defined, tells how many mantissa bits there are in double precision floating point format. Note that this is usually C minus one, since with the standard C 754 formats C includes the implicit bit which doesn't really exist. =item C From F: This variable contains comma-separated list of hexadecimal bytes for the double precision not-a-number. =item C From F: This variable contains the value of the C symbol, which indicates to the C program how many bytes there are in a double. =item C From F: Indicates the macro to be used to generate normalized random numbers. Uses randfunc, often divided by (double) (((unsigned long) 1 << randbits)) in order to normalize the result. In C programs, the macro C is mapped to drand01. =item C From F: This variable encodes the prototype of drand48_r. It is zero if d_drand48_r is undef, and one of the C macros of F if d_drand48_r is defined. =item C From F: This variable holds the location of the dtrace executable. =item C From F: Whether we need to build an object file with the dtrace tool. =item C From F: Whether dtrace accepts -xnolibs. If available we call dtrace -h and dtrace -G with -xnolibs to allow dtrace to run in a jail on FreeBSD. =item C From F: This variable holds a list of C extension files we want to link dynamically into the package. It is used by Makefile. =back =head2 e =over 4 =item C From F: This variable bears the symbolic errno code set by read() when no data is present on the file and non-blocking I/O was enabled (otherwise, read() blocks naturally). =item C From F: This variable conditionally defines C if this system uses C encoding. =item C From F: This variable is used internally by Configure to determine the full pathname (if any) of the echo program. After Configure runs, the value is reset to a plain C and is not useful. =item C From F: This variable is used internally by Configure to determine the full pathname (if any) of the egrep program. After Configure runs, the value is reset to a plain C and is not useful. =item C From F: This variable is defined but not used by Configure. The value is the empty string and is not useful. =item C From F: This variable encodes the prototype of endgrent_r. It is zero if d_endgrent_r is undef, and one of the C macros of F if d_endgrent_r is defined. =item C From F: This variable encodes the prototype of endhostent_r. It is zero if d_endhostent_r is undef, and one of the C macros of F if d_endhostent_r is defined. =item C From F: This variable encodes the prototype of endnetent_r. It is zero if d_endnetent_r is undef, and one of the C macros of F if d_endnetent_r is defined. =item C From F: This variable encodes the prototype of endprotoent_r. It is zero if d_endprotoent_r is undef, and one of the C macros of F if d_endprotoent_r is defined. =item C From F: This variable encodes the prototype of endpwent_r. It is zero if d_endpwent_r is undef, and one of the C macros of F if d_endpwent_r is defined. =item C From F: This variable encodes the prototype of endservent_r. It is zero if d_endservent_r is undef, and one of the C macros of F if d_endservent_r is defined. =item C From F: 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. =item C From F: This is an old synonym for _exe. =item C From F: This variable is used internally by Configure to determine the full pathname (if any) of the expr program. After Configure runs, the value is reset to a plain C and is not useful. =item C From F: This variable holds a list of all extension files (both C and non-xs) installed with the package. It is propagated to F and is typically used to test whether a particular extension is available. =item C From F: C C requires C where C++ requires 'extern C'. This variable can be used in Configure to do the right thing. =item C From F: This variable holds a list of extra modules to install. =back =head2 f =over 4 =item C From F: 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. =item C From F: This symbol, if defined, tells that fflush(C) correctly flushes all pending stdio output without side effects. In particular, on some platforms calling fflush(C) *still* corrupts C if it is a pipe. =item C From F: This variable is defined but not used by Configure. The value is the empty string and is not useful. =item C From F: This variable defines the first file searched by make. On unix, it is makefile (then Makefile). On case-insensitive systems, it might be something else. This is only used to deal with convoluted make depend tricks. =item C From F: This variable is defined but not used by Configure. The value is the empty string and is not useful. =item C From F: This variable contains the size of a fpostype in bytes. =item C From F: This variable defines Fpos_t to be something like fpos_t, long, uint, or whatever type is used to declare file positions in libc. =item C From F: This variable contains the return type of free(). It is usually void, but occasionally int. =item C From F: This variable contains the command used by Configure to copy files from the target host. Useful and available only during Perl build. The string C<:> if not cross-compiling. =item C From F: This variable contains the full pathname to C, whether or not the user has specified C. This is only used in the F. =item C From F: This variable contains the full pathname to C, whether or not the user has specified C. This is only used in the compiled C program, and we assume that all systems which can share this executable will have the same full pathname to F =item C From F: This variable contains the full pathname to C, whether or not the user has specified C. This is only used in the compiled C program, and we assume that all systems which can share this executable will have the same full pathname to F =back =head2 g =over 4 =item C From F: If C cc (gcc) is used, this variable will enable (if set) the -ansi and -pedantic ccflags for building core files (through cflags script). (See F for full description). =item C From F: If C cc (gcc) is used, this variable holds the operating system and version used to compile gcc. It is set to '' if not gcc, or if nothing useful can be parsed as the os version. =item C From F: If C cc (gcc) is used, this variable holds C<1> or C<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. =item C From F: This variable encodes the prototype of getgrent_r. It is zero if d_getgrent_r is undef, and one of the C macros of F if d_getgrent_r is defined. =item C From F: This variable encodes the prototype of getgrgid_r. It is zero if d_getgrgid_r is undef, and one of the C macros of F if d_getgrgid_r is defined. =item C From F: This variable encodes the prototype of getgrnam_r. It is zero if d_getgrnam_r is undef, and one of the C macros of F if d_getgrnam_r is defined. =item C From F: This variable encodes the prototype of gethostbyaddr_r. It is zero if d_gethostbyaddr_r is undef, and one of the C macros of F if d_gethostbyaddr_r is defined. =item C From F: This variable encodes the prototype of gethostbyname_r. It is zero if d_gethostbyname_r is undef, and one of the C macros of F if d_gethostbyname_r is defined. =item C From F: This variable encodes the prototype of gethostent_r. It is zero if d_gethostent_r is undef, and one of the C macros of F if d_gethostent_r is defined. =item C From F: This variable encodes the prototype of getlogin_r. It is zero if d_getlogin_r is undef, and one of the C macros of F if d_getlogin_r is defined. =item C From F: This variable encodes the prototype of getnetbyaddr_r. It is zero if d_getnetbyaddr_r is undef, and one of the C macros of F if d_getnetbyaddr_r is defined. =item C From F: This variable encodes the prototype of getnetbyname_r. It is zero if d_getnetbyname_r is undef, and one of the C macros of F if d_getnetbyname_r is defined. =item C From F: This variable encodes the prototype of getnetent_r. It is zero if d_getnetent_r is undef, and one of the C macros of F if d_getnetent_r is defined. =item C From F: This variable encodes the prototype of getprotobyname_r. It is zero if d_getprotobyname_r is undef, and one of the C macros of F if d_getprotobyname_r is defined. =item C From F: This variable encodes the prototype of getprotobynumber_r. It is zero if d_getprotobynumber_r is undef, and one of the C macros of F if d_getprotobynumber_r is defined. =item C From F: This variable encodes the prototype of getprotoent_r. It is zero if d_getprotoent_r is undef, and one of the C macros of F if d_getprotoent_r is defined. =item C From F: This variable encodes the prototype of getpwent_r. It is zero if d_getpwent_r is undef, and one of the C macros of F if d_getpwent_r is defined. =item C From F: This variable encodes the prototype of getpwnam_r. It is zero if d_getpwnam_r is undef, and one of the C macros of F if d_getpwnam_r is defined. =item C From F: This variable encodes the prototype of getpwuid_r. It is zero if d_getpwuid_r is undef, and one of the C macros of F if d_getpwuid_r is defined. =item C From F: This variable encodes the prototype of getservbyname_r. It is zero if d_getservbyname_r is undef, and one of the C macros of F if d_getservbyname_r is defined. =item C From F: This variable encodes the prototype of getservbyport_r. It is zero if d_getservbyport_r is undef, and one of the C macros of F if d_getservbyport_r is defined. =item C From F: This variable encodes the prototype of getservent_r. It is zero if d_getservent_r is undef, and one of the C macros of F if d_getservent_r is defined. =item C From F: This variable encodes the prototype of getspnam_r. It is zero if d_getspnam_r is undef, and one of the C macros of F if d_getspnam_r is defined. =item C From F: This variable contains the format string used for printing a Gid_t. =item C From F: This variable contains the signedness of a gidtype. 1 for unsigned, -1 for signed. =item C From F: This variable contains the size of a gidtype in bytes. =item C From F: 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. =item C From F: 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. =item C From F: This variable is used internally by Configure to determine the full pathname (if any) of the gmake program. After Configure runs, the value is reset to a plain C and is not useful. =item C From F: This variable encodes the prototype of gmtime_r. It is zero if d_gmtime_r is undef, and one of the C macros of F if d_gmtime_r is defined. =item C From F: This variable contains the version number of the C C library. It is usually something like F<2.2.5>. It is a plain '' if this is not the C C library, or if the version is unknown. =item C From F: This variable is used internally by Configure to determine the full pathname (if any) of the grep program. After Configure runs, the value is reset to a plain C and is not useful. =item C From F: This variable contains a command that produces the text of the F file. This is normally "cat F", but can be "ypcat group" when C is used. On some systems, such as os390, there may be no equivalent command, in which case this variable is unset. =item C From F: 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(). Usually, this is the same as gidtype (gid_t), but sometimes it isn't. =item C From F: This variable is used internally by Configure to determine the full pathname (if any) of the gzip program. After Configure runs, the value is reset to a plain C and is not useful. =back =head2 h =over 4 =item C From F: This is variable gets set in various places to tell i_fcntl that should be included. =item C From F: This is variable gets set in various places to tell i_sys_file that should be included. =item C From F: Gives the type of hints used for previous answers. May be one of C, C or C. =item C From F: This variable contains a command that produces the text of the F file. This is normally "cat F", but can be "ypcat hosts" when C is used. On some systems, such as os390, there may be no equivalent command, in which case this variable is unset. =item C From F: This variable contains the path to a generate_uudmap binary that can be run on the host C when cross-compiling. Useful and available only during Perl build. Empty string '' if not cross-compiling. =item C From F: This variable contains the original value of C<$^O> for hostperl when cross-compiling. This is useful to pick the proper tools when running build code in the host. Empty string '' if not cross-compiling. =item C From F: This variable contains the path to a miniperl binary that can be run on the host C when cross-compiling. Useful and available only during Perl build. Empty string '' if not cross-compiling. =item C From F: This variable contains the name of the directory in which html source pages are to be put. This directory is for pages that describe whole programs, not libraries or modules. It is intended to correspond roughly to section 1 of the Unix manuals. =item C From F: This variable is the same as the html1dir variable, but is filename expanded at configuration time, for convenient use in makefiles. =item C From F: This variable contains the name of the directory in which html source pages are to be put. This directory is for pages that describe libraries or modules. It is intended to correspond roughly to section 3 of the Unix manuals. =item C From F: This variable is the same as the html3dir variable, but is filename expanded at configuration time, for convenient use in makefiles. =back =head2 i =over 4 =item C From F: This variable is the size of an I16 in bytes. =item C From F: This variable contains the C type used for Perl's I16. =item C From F: This variable is the size of an I32 in bytes. =item C From F: This variable contains the C type used for Perl's I32. =item C From F: This variable is the size of an I64 in bytes. =item C From F: This variable contains the C type used for Perl's I64. =item C From F: This variable is the size of an I8 in bytes. =item C From F: This variable contains the C type used for Perl's I8. =item C From F: This variable conditionally defines the C symbol, and indicates whether a C program should include . =item C From F: This variable conditionally defines the C symbol, and indicates whether a C program can include . =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that exists and should be included. =item C From F: This variable conditionally defines the C symbol, and indicates whether a C program should include . =item C From F: This variable conditionally defines the C symbol, and indicates whether a C program may include Berkeley's C include file . =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that exists and should be included. =item C From F: This variable conditionally defines C, which indicates to the C program that it should include . =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that exists and should be included. =item C From F: This variable conditionally defines the C symbol, and indicates whether a C program may include , for backtrace() support. =item C From F: This variable controls the value of C (which tells the C program to include ). =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that exists and should be included. =item C From F: This variable conditionally defines the C symbol, and indicates whether a C program should include . =item C From F: This variable conditionally defines the C symbol, and indicates whether a C program should include . =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that exists and should be included. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that > exists and should be included. This is the location of the F compatibility file in Debian 4.0. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that exists and should be included. This was the location of the F compatibility file in RedHat 7.1. =item C From F: This variable conditionally defines the C symbol, and indicates whether a C program should include . =item C From F: This variable conditionally defines the C symbol, and indicates whether a C program should include . =item C From F: This variable conditionally defines the C symbol, and indicates whether a C program should include . =item C From F: This variable conditionally defines the C symbol, and indicates whether a C program should include . =item C From F: This variable conditionally defines the C symbol, and indicates whether a C program should include . =item C From F: This variable conditionally defines the C symbol, and indicates whether a C program should include . =item C From F: This variable conditionally defines the C symbol, and indicates whether a C program should include . =item C From F: This variable conditionally defines the C symbol, and indicates whether a C program should include . =item C From F: This variable conditionally defines the C symbol, and indicates whether a C program should include . =item C From F: This variable conditionally defines the C symbol, and indicates whether a C program should include . =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that exists and should be included. =item C From F: This variable conditionally defines the C symbol, and indicates whether a C program should include . =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that exists and should be included. =item C From F: This variable conditionally defines the C symbol, and indicates whether a C program should include . =item C From F: This variable conditionally defines C, which indicates to the C program that it should include . Otherwise, you may try . =item C From F: This variable conditionally defines the C symbol, and indicates whether a C program should include . =item C From F: This variable conditionally defines the C symbol, and indicates whether a C program should include . =item C From F: This variable conditionally defines the C symbol, and indicates whether a C program should include . =item C From F: This variable conditionally defines C, which indicates to the C program that it should include . =item C From F: This variable conditionally defines C, which indicates to the C program that it should include . =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that exists and should be included. Some System V systems might need this instead of . =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that it should include rather than . =item C From F: This variable conditionally defines the C symbol, and indicates whether a C program should include . =item C From F: This variable conditionally defines the C symbol, and indicates whether a C program should include . =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that exists and should be included. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that exists and should be included. =item C From F: This variable unconditionally defines the C symbol. =item C From F: This variable conditionally defines the C symbol, and indicates whether a C program should include . =item C From F: This variable conditionally defines the C symbol, and indicates whether a C program should include . =item C From F: This variable conditionally defines the C symbol, and indicates whether a C program should include . =item C From F: This variable conditionally defines the C symbol, and indicates whether a C program should include to get C and friends. =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that exists and should be included in preference to . =item C From F: This variable conditionally defines C, which indicates to the C program that it should include instead of . =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that exists and should be included. =item C From F: This variable conditionally defines the C symbol, and indicates whether a C program should include . =item C From F: This variable conditionally defines the C symbol, and indicates whether a C program should include . =item C From F: This variable conditionally defines the C symbol, and indicates whether a C program should include . =item C From F: This variable conditionally defines the C symbol, and indicates whether a C program should include . =item C From F: This variable conditionally defines the C symbol, and indicates whether a C program should include . =item C From F: This variable conditionally defines the C symbol, and indicates whether a C program should include . =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that it should include . =item C From F: This variable conditionally defines the C symbol, and indicates whether a C program should include . =item C From F: This variable conditionally defines the C symbol, and indicates whether a C program should include . =item C From F: This variable conditionally defines C, which indicates to the C program that it should include in order to get the definition of struct timeval. =item C From F: This variable conditionally defines C to indicate to the C program that socket ioctl codes may be found in instead of . =item C From F: This variable conditionally defines the C symbol, and indicates whether a C program should include . =item C From F: This variable conditionally defines the C symbol, and indicates whether a C program should include . =item C From F: This variable conditionally defines the C symbol, and indicates whether a C program should include . =item C From F: This variable conditionally defines C, which indicates to the C program that it should include . =item C From F: This variable conditionally defines C, which indicates to the C program that it should include with C defined. =item C From F: This variable conditionally defines the C symbol, and indicates whether a C program should include . =item C From F: This variable conditionally defines the C symbol, and indicates whether a C program should include . =item C From F: This variable conditionally defines the C symbol, and indicates whether a C program should include . =item C From F: This variable conditionally defines C, which indicates to the C program that it should include to get C domain socket definitions. =item C From F: This variable conditionally defines the C symbol, and indicates whether a C program should include . =item C From F: This variable conditionally defines the C symbol, and indicates whether a C program should include . =item C From F: This variable conditionally defines C, which indicates to the C program that it should include . =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that it should include rather than . =item C From F: This variable conditionally defines the C symbol, which indicates to the C program that the C file is to be included. =item C From F: This variable unconditionally defines C, which indicates to the C program that it should include . =item C From F: This variable conditionally defines the C symbol, and indicates whether a C program should include . =item C From F: This variable conditionally defines the C symbol, and indicates whether a C program should include . =item C From F: This variable conditionally defines the C symbol, and indicates whether a C program should include . =item C From F: This variable conditionally defines the C symbol, and indicates whether a C program should include F. =item C From F: This variable conditionally defines the C symbol, that indicates whether a C program may include . =item C From F: This variable conditionally defines the C symbol, that indicates whether a C program may include . =item C From F: This symbol, if defined, indicates to the C program that the header F is available. See also xlocale_needed. =item C From F: This variable should be non-empty if non-versioned shared libraries (F) are to be ignored (because they cannot be linked against). =item C From F: This variable specifies the list of subdirectories in over which F:incpush() and F will automatically search when adding directories to @C. The elements in the list are separated by spaces. This is only useful if you have a perl library directory tree structured like the default one. See C for how this works. The versioned site_perl directory was introduced in 5.005, so that is the lowest possible value. This list includes architecture-dependent directories back to version $api_versionstring (e.g. 5.5.640) and architecture-independent directories all the way back to 5.005. =item C From F: This variable holds the same list as inc_version_list, but each item is enclosed in double quotes and separated by commas, suitable for use in the C initialization. =item C From F: This variable must precede the normal include path to get the right one, as in F<$incpath/usr/include> or F<$incpath/usr/lib>. Value can be "" or F on mips. =item C From F: This variable must precede the normal include path to get the right one, as in F<$incpath/usr/include> or F<$incpath/usr/lib>. Value can be "" or F on mips. =item C From F: This variable is defined but not used by Configure. The value is the empty string and is not useful. =item C From F: When userelocatableinc is true, this variable holds the location that make install should copy the perl binary to, with all the run-time relocatable paths calculated from this at install time. When used, it is initialized to the original value of binexp, and then binexp is set to F<.../>, as the other binaries are found relative to the perl binary. =item C From F: This variable is really the same as archlibexp but may differ on those systems using C. For extra portability, only this variable should be used in makefiles. =item C From F: This variable is the same as binexp unless C is running in which case the user is explicitly prompted for it. This variable should always be used in your makefiles for maximum portability. =item C From F: This variable is really the same as html1direxp, unless you are using a different installprefix. For extra portability, you should only use this variable within your makefiles. =item C From F: This variable is really the same as html3direxp, unless you are using a different installprefix. For extra portability, you should only use this variable within your makefiles. =item C From F: This variable is really the same as man1direxp, unless you are using C 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 makefiles. =item C From F: This variable is really the same as man3direxp, unless you are using C 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 makefiles. =item C From F: 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. =item C From F: This variable holds the full absolute path of installprefix with all F<~>-expansion done. =item C From F: This variable is really the same as privlibexp but may differ on those systems using C. For extra portability, only this variable should be used in makefiles. =item C From F: This variable is usually the same as scriptdirexp, unless you are on a system running C, in which case they may differ slightly. You should always use this variable within your makefiles for portability. =item C From F: This variable is really the same as sitearchexp but may differ on those systems using C. For extra portability, only this variable should be used in makefiles. =item C From F: This variable is usually the same as sitebinexp, unless you are on a system running C, in which case they may differ slightly. You should always use this variable within your makefiles for portability. =item C From F: This variable is really the same as sitehtml1direxp, unless you are using C in which case it points to the read/write location whereas html1direxp only points to the read-only access location. For extra portability, you should only use this variable within your makefiles. =item C From F: This variable is really the same as sitehtml3direxp, unless you are using C in which case it points to the read/write location whereas html3direxp only points to the read-only access location. For extra portability, you should only use this variable within your makefiles. =item C From F: This variable is really the same as sitelibexp but may differ on those systems using C. For extra portability, only this variable should be used in makefiles. =item C From F: This variable is really the same as siteman1direxp, unless you are using C 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 makefiles. =item C From F: This variable is really the same as siteman3direxp, unless you are using C 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 makefiles. =item C From F: This variable is usually the same as sitescriptexp, unless you are on a system running C, in which case they may differ slightly. You should always use this variable within your makefiles for portability. =item C From F: This variable describes the C