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(autoconf.info)Obsolete Macros

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Obsolete Macros
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   Configuration and portability technology has evolved over the years.
Often better ways of solving a particular problem are developed, or
ad-hoc approaches are systematized.  This process has occurred in many
parts of Autoconf.  One result is that some of the macros are now
considered "obsolete"; they still work, but are no longer considered
the best thing to do.  Autoconf provides the `AC_OBSOLETE' macro to
warn users producing `configure' scripts when they use obsolete macros,
to encourage them to modernize.  A sample call is:

     AC_OBSOLETE([$0], [; use AC_CHECK_HEADERS(unistd.h) instead])dnl

 - Macro: AC_OBSOLETE (THIS-MACRO-NAME [, SUGGESTION])
     Make `m4' print a message on the standard error output warning that
     THIS-MACRO-NAME is obsolete, and giving the file and line number
     where it was called.  THIS-MACRO-NAME should be the name of the
     macro that is calling `AC_OBSOLETE'.  If SUGGESTION is given, it
     is printed at the end of the warning message; for example, it can
     be a suggestion for what to use instead of THIS-MACRO-NAME.