This is because AM_SUBST_NOTMAKE is only offically supported since
this version of automake.
+2011-04-14 Werner Koch <wk@g10code.com>
+
+ * configure.ac: Require automake 1.11.
+
2011-04-06 Werner Koch <wk@g10code.com>
* autogen.sh (--build-w32): Support option --build-w64.
# (Process this file with autoconf to produce a configure script.)
AC_PREREQ(2.59)
-min_automake_version="1.10"
+min_automake_version="1.11"
# Version number: Remember to change it immediately *after* a release.
# Make sure to run "svn up" and "./autogen.sh --force"