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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.
_ALL_SOURCE. Allows the use of some BSD functions. Should be called before any macros that run the C compiler.
LIBSif necessary for POSIX facilities. Call this after
AC_PROG_CCand before any other macros that use POSIX interfaces. INTERACTIVE UNIX is no longer sold, and Sun says that they will drop support for it on 2006-07-23, so this macro is becoming obsolescent.
_POSIX_1_SOURCEto be 2. This allows the use of POSIX facilities. Should be called before any macros that run the C compiler.