diff -r aa50a64b3a6e -r 7ea73c90a7f0 configure.ac
--- a/configure.ac	Mon Oct 02 19:00:23 2006 +0000
+++ b/configure.ac	Mon Oct 09 08:06:31 2006 +0000
@@ -15,6 +15,13 @@
 
 dnl Checks for libraries.
 PKG_CHECK_MODULES([GTK], [libgnomecanvasmm-2.6 >= 2.6.0 gtkmm-2.4 >= 2.6])
+
+AC_ARG_WITH([lemon-prefix],
+AS_HELP_STRING([--with-lemon-prefix@<:@=PREFIX@:>@], [search for LEMON under PREFIX]), [], [with_lemon_prefix=no])
+if test x"$with_lemon_prefix" != x"no"; then
+  PKG_CONFIG_PATH="$with_lemon_prefix/lib/pkgconfig/"
+fi
+
 PKG_CHECK_MODULES([LEMON_0_5], [lemon >= 0.5],
   [lemon_0_5_found=yes], [
     AC_MSG_RESULT([no])