diff -uNr mod_mono-2.4.orig/configure.in mod_mono-2.4/configure.in
--- mod_mono-2.4.orig/configure.in	2009-03-09 18:02:00.000000000 +0100
+++ mod_mono-2.4/configure.in	2009-04-21 07:07:43.000000000 +0200
@@ -1,6 +1,6 @@
 AC_INIT(src/mod_mono.c)
 AM_INIT_AUTOMAKE(mod_mono, 2.10)
-AM_CONFIG_HEADER(include/mod_mono_config.h:config.in)
+AC_CONFIG_HEADERS(include/mod_mono_config.h:config.in)
 
 AC_PROG_CC
 AM_PROG_LIBTOOL
@@ -15,6 +15,7 @@
         AC_MSG_ERROR([You need to install pkg-config])
 fi
 
+m4_pattern_allow([^PKG_PATH$])
 PKG_PATH=""
 AC_ARG_WITH(crosspkgdir, [  --with-crosspkgdir=/path/to/pkg-config/dir],
         if test x$with_crosspkgdir = "x"; then