diff -r 7fdaa05a69a1 -r 00f8d9f9920d test/digraph_test.cc
--- a/test/digraph_test.cc	Thu Sep 13 11:56:19 2012 +0200
+++ b/test/digraph_test.cc	Thu Sep 13 12:02:27 2012 +0200
@@ -442,6 +442,7 @@
     a2 = g.addArc(n2, n1),
     a3 = g.addArc(n2, n3),
     a4 = g.addArc(n2, n3);
+  ignore_unused_variable_warning(a2,a3,a4);
 
   digraphCopy(g, G).nodeRef(nref).run();