Many of the macros were renamed in Autoconf version 2. You can still
use the old names, but the new ones are clearer, and it's easier to find
the documentation for them. See section Old Macro Names, for a table showing
the new names for the old macros. Use the autoupdate program to
convert your `configure.in' to using the new macro names.
See section Using autoupdate to Modernize configure.
Some macros have been superseded by similar ones that do the job better,
but are not call-compatible. If you get warnings about calling obsolete
macros while running autoconf, you may safely ignore them, but
your configure script will generally work better if you follow
the advice it prints about what to replace the obsolete macros with. In
particular, the mechanism for reporting the results of tests has
changed. If you were using echo or AC_VERBOSE (perhaps
via AC_COMPILE_CHECK), your configure script's output will
look better if you switch to AC_MSG_CHECKING and
AC_MSG_RESULT. See section Printing Messages. Those macros work best
in conjunction with cache variables. See section Caching Results.
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