that you will get a confusing error message if you run autoconf on
a configure.ac that neglects to use AC_INIT or AC_OUTPUT.
-*** AC_USE_SYSTEM_EXTENSIONS now enables C23 Annex F extensions
- by defining __STDC_WANT_IEC_60559_EXT__.
-
*** AC_SYS_LARGEFILE now arranges for 64-bit time_t if possible.
*** m4sh diversions like BINSH have been renumbered.
*** New macro AC_SYS_YEAR2038 for 64-bit time_t.
+*** AC_USE_SYSTEM_EXTENSIONS now enables C23 Annex F extensions
+ by defining __STDC_WANT_IEC_60559_EXT__.
+
** Obsolete features and new warnings
*** Autoconf now quotes 'like this' instead of `like this'.