--- /dev/null
+--- postgresql-9.1.0/configure.in.org 2011-09-12 21:35:12.735636961 +0200
++++ postgresql-9.1.0/configure.in 2011-09-12 21:35:39.342896072 +0200
+@@ -19,10 +19,10 @@
+
+ AC_INIT([PostgreSQL], [9.1.0], [pgsql-bugs@postgresql.org])
+
+-m4_if(m4_defn([m4_PACKAGE_VERSION]), [2.63], [], [m4_fatal([Autoconf version 2.63 is required.
+-Untested combinations of 'autoconf' and PostgreSQL versions are not
+-recommended. You can remove the check from 'configure.in' but it is then
+-your responsibility whether the result works or not.])])
++dnl m4_if(m4_defn([m4_PACKAGE_VERSION]), [2.63], [], [m4_fatal([Autoconf version 2.63 is required.
++dnl Untested combinations of 'autoconf' and PostgreSQL versions are not
++dnl recommended. You can remove the check from 'configure.in' but it is then
++dnl your responsibility whether the result works or not.])])
+ AC_COPYRIGHT([Copyright (c) 1996-2011, PostgreSQL Global Development Group])
+ AC_CONFIG_SRCDIR([src/backend/access/common/heaptuple.c])
+ AC_CONFIG_AUX_DIR(config)