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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, hence they should be replaced with more modern
macros. Ideally, autoupdate should substitute the old macro calls
with their modern implementation.
Autoconf provides a simple means to obsolete a macro.
AC_DEFUN is that the user will be warned that
old-macro is now obsolete.
If she then uses autoupdate, the call to old-macro will be
replaced by the modern implementation. The additional
message is then printed.
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