--enable-site-macro-dir option.
with older Gettexts.
Many thanks to Bruno Haible for autopoint!
+- The -I DIR or --include=DIR option now appends DIR to the include path
+ instead of prepending; this is for consistency with other GNU tools.
+ The new -B DIR or --prepend-include=DIR option has the old behavior.
+
+- When configured with the new --enable-site-macro-dir=DIR configure-time
+ option, Autoconf now appends DIR to the default include path.
+
** Macros
- AC_CONFIG_LINKS now makes copies if it can't make links.