local M4 macros. This macro overcomes some of the shortfalls in the
older AC_CONFIG_MACRO_DIR, which could only be used once; although
the older macro remains for compatibility with older tools. The
- newer macro will be used by the upcoming Automake 1.13 release to
- eliminate the need to specify ACLOCAL_AMFLAGS in Makefile.am.
+ newer macro is used by Automake 1.13 and later to eliminate the
+ need to specify ACLOCAL_AMFLAGS in Makefile.am.
- AC_PROG_CC now prefers C11 if available, falling back on C99 and
then on C89 as before. Similarly, AC_PROG_CXX now prefers C++11