--- metadata.xml.orig	2010-01-29 05:20:36.689179198 +0100
+++ metadata.xml	2010-01-29 05:16:14.787248671 +0100
@@ -9,5 +9,6 @@
 	<longdescription>Math Graphics Library</longdescription>
 	<use>
 		<flag name='octave'>Add bindings for <pkg>sci-mathematics/octave</pkg></flag>
+		<flag name='mpi'>Use mpi wrappers for compilation. Requirement for <pkg>sci-libs/hdf5</pkg>[mpi]</flag>
 	</use>
 </pkgmetadata>