UNIX Variants

The following macros check for certain operating systems that need special treatment for some programs, due to exceptional oddities in their header files or libraries. These macros are warts; they will be replaced by a more systematic approach, based on the functions they make available or the environments they provide.

Macro: AC_AIX

If on AIX, define _ALL_SOURCE. Allows the use of some BSD functions. Should be called before any macros that run the C compiler.

Macro: AC_DYNIX_SEQ

If on Dynix/PTX (Sequent UNIX), add `-lseq' to output variable LIBS. This macro is obsolete; instead, use AC_FUNC_GETMNTENT.

Macro: AC_IRIX_SUN

If on IRIX (Silicon Graphics UNIX), add `-lsun' to output variable LIBS. This macro is obsolete. If you were using it to get getmntent, use AC_FUNC_GETMNTENT instead. If you used it for the NIS versions of the password and group functions, use `AC_CHECK_LIB(sun, getpwnam)'.

Macro: AC_ISC_POSIX

If on a POSIXized ISC UNIX, define _POSIX_SOURCE and add `-posix' (for the GNU C compiler) or `-Xp' (for other C compilers) to output variable CC. This allows the use of POSIX facilities. Must be called after AC_PROG_CC and before any other macros that run the C compiler.

Macro: AC_MINIX

If on Minix, define _MINIX and _POSIX_SOURCE and define _POSIX_1_SOURCE to be 2. This allows the use of POSIX facilities. Should be called before any macros that run the C compiler.

Macro: AC_SCO_INTL

If on SCO UNIX, add `-lintl' to output variable LIBS. This macro is obsolete; instead, use AC_FUNC_STRFTIME.

Macro: AC_XENIX_DIR

If on Xenix, add `-lx' to output variable LIBS. Also, if `dirent.h' is being used, add `-ldir' to LIBS. This macro is obsolete; use AC_HEADER_DIRENT instead.

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