--- metadata.xml.orig	2015-02-17 15:31:17.000000000 +0300
+++ metadata.xml	2015-05-25 17:32:48.000000000 +0300
@@ -17,6 +17,7 @@
   primarily for the visual display of scientific data.
 </longdescription>
   <use>
+    <flag name="compat">Enable backwards compatibility with version 4 syntax</flag>
     <flag name="gd">Add support for <pkg>media-libs/gd</pkg>.
     Needed for GIF, JPEG, and PNG image output.</flag>
     <flag name="libcerf">Enable special functions from <pkg>sci-libs/libcerf</pkg></flag>