diff -r 764826c6e2b4 -r 36fa2fee7144 test/min_cost_arborescence_test.cc
--- a/test/min_cost_arborescence_test.cc	Thu Nov 08 09:07:41 2012 +0100
+++ b/test/min_cost_arborescence_test.cc	Wed Nov 28 12:05:27 2012 +0100
@@ -91,6 +91,7 @@
   Arc e;
   VType c;
   bool b;
+  ignore_unused_variable_warning(c,b);
   int i;
   CostMap cost;
   ArbMap arb;