Require a specific Autoconf version, instead of a lower bound only.

petere · petere · commit 70777be20c6f · 2007-11-26T12:04:54.000Z
diff --git a/configure.in b/configure.in
@@ -1,5 +1,5 @@
 dnl Process this file with autoconf to produce a configure script.
-dnl $Header: /cvsroot/pgsql/configure.in,v 1.217.2.29 2007/09/15 00:26:05 scrappy Exp $
+dnl $Header: /cvsroot/pgsql/configure.in,v 1.217.2.30 2007/11/26 12:04:54 petere Exp $
 dnl
 dnl Developers, please strive to achieve this order:
 dnl
@@ -26,7 +26,7 @@ m4_undefine([infodir])
 m4_undefine([info])
 AC_SUBST(docdir)
 
-AC_PREREQ(2.53)
+m4_if(m4_defn([m4_PACKAGE_VERSION]), [2.53], [], [m4_fatal([Autoconf version 2.53 is required])])
 AC_COPYRIGHT([Copyright 2002 PostgreSQL Global Development Group])
 AC_CONFIG_SRCDIR([src/backend/access/common/heaptuple.c])
 AC_CONFIG_AUX_DIR(config)
