diff -up tclreadline-2.1.0/configure.in.automake-1_13 tclreadline-2.1.0/configure.in
--- tclreadline-2.1.0/configure.in.automake-1_13	2013-01-10 02:01:17.861752876 +0100
+++ tclreadline-2.1.0/configure.in	2013-01-10 02:02:35.160023965 +0100
@@ -10,7 +10,7 @@ dnl Copyright (c) 1998 - 2000, Johannes
 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)