--- configure.ac.orig	2000-12-07 18:45:45.000000000 -0600
+++ configure.ac	2013-02-12 01:56:30.000000000 -0600
@@ -10,7 +10,7 @@
 dnl This software is copyright under the BSD license.
 
 AC_INIT(tclreadline.c)
-AM_CONFIG_HEADER(config.h)
+AC_CONFIG_HEADERS([config.h])
 AC_PREREQ(2.13)
 AC_REVISION($Revision: 2.26 $)
 AC_CONFIG_AUX_DIR(./aux)