+2009-08-19 Ralf Wildenhues <Ralf.Wildenhues@gmx.de>
+
+ * override.m4 (AC_DISABLE_OPTION_CHECKING): Define to be
+ empty if not defined, to avoid error with 2.59.
+ (_AC_LANG_IO_PROGRAM): When the Autoconf version is exactly
+ 2.64, avoid per-language instances to drop fopen from test
+ program.
+