diff --git a/www/seamonkey/seamonkey.conf b/www/seamonkey/seamonkey.conf
index 80fe0a398..e64e6d286 100644
--- a/www/seamonkey/seamonkey.conf
+++ b/www/seamonkey/seamonkey.conf
@@ -35,6 +35,7 @@ EOT
 mozilla_postinstall() {
 	echo "Copy all mozilla include files" \
 	     "(required for building galeon, evolution, etc.) ..."
+	mkdir -p $includedir/$pkg-$ver/xpcom
 	cp -v xpcom/base/nscore.h  $includedir/$pkg-$ver/xpcom/
 	cp -v xpcom/glue/nsDebug.h $includedir/$pkg-$ver/xpcom/
 	cp -rL dist/include/*      $includedir/$pkg-$ver/