--- configure.orig	2008-06-24 09:15:05.000000000 -0400
+++ configure	2009-04-10 17:04:02.000000000 -0400
@@ -3789,7 +3789,7 @@
   if test $succeeded = yes; then
       MOZPLUG_CFLAGS="${MOZPLUG_CFLAGS} -I`$PKG_CONFIG --variable=includedir libxul`"
 MOZILLA_HOME=`$PKG_CONFIG --variable=libdir libxul`
-GECKO_IDLDIR=`$PKG_CONFIG --variable=idldir libxul`
+GECKO_IDLDIR=`$PKG_CONFIG --variable=idldir libxul`/`$PKG_CONFIG --variable=includetype libxul`
 
   else
      { echo "$as_me:$LINENO: WARNING: libxul not found" >&5