diff -up ntop-5.0.1/configure.in.automake-1_13 ntop-5.0.1/configure.in
--- ntop-5.0.1/configure.in.automake-1_13	2012-08-13 09:35:26.000000000 +0200
+++ ntop-5.0.1/configure.in	2013-01-06 01:12:54.957725676 +0100
@@ -56,7 +56,7 @@ dnl>
 dnl> generate the config header
 dnl>
 umask 002
-AM_CONFIG_HEADER(config.h)
+AC_CONFIG_HEADERS(config.h)
 
 HAS_ERROR=
 HAS_WARNING=
@@ -324,7 +324,7 @@ dnl>
 echo
 echo "Checking C compiler program and features..."
 echo
-AM_PROG_CC_STDC
+AC_PROG_CC
 if test ".${ac_cv_prog_cc_stdc}" = ".no"; then
     echo
     echo "*******************************************************************"