diff -up ntp-4.2.6p5/configure.ac.automake-1_13 ntp-4.2.6p5/configure.ac
--- ntp-4.2.6p5/configure.ac.automake-1_13	2011-09-23 05:17:25.000000000 +0200
+++ ntp-4.2.6p5/configure.ac	2013-01-06 00:46:08.457176055 +0100
@@ -40,7 +40,7 @@ dnl the 'build' machine is where we run
 dnl the 'host' machine is where the resulting stuff runs.
 AC_DEFINE_UNQUOTED([STR_SYSTEM], ["$host"],
     [canonical system (cpu-vendor-os) of where we should run])
-AM_CONFIG_HEADER([config.h])
+AC_CONFIG_HEADERS([config.h])
 dnl AC_ARG_PROGRAM
 
 ntp_atom_ok=${ntp_atom_ok=no}