fixed comment in configure.ac
@@ -10,7 +10,7 @@ dnl under the terms of the License (based on the MIT/X license) contained
dnl in the file COPYING that comes with this distribution.
dnl
-dnl Ensure that Expat is configured with autoconf 2.58 or newer
+dnl Ensure that Expat is configured with autoconf 2.69 or newer.
AC_PREREQ(2.69)
dnl Get the version number of Expat, using m4's esyscmd() command to run
