diff -r c5990f454032 -r 7e368d9b67f7 test/min_cost_arborescence_test.cc
--- a/test/min_cost_arborescence_test.cc	Wed Mar 28 19:39:56 2012 +0200
+++ b/test/min_cost_arborescence_test.cc	Wed Nov 28 11:41:40 2012 +0100
@@ -91,6 +91,7 @@
   Arc e;
   VType c;
   bool b;
+  ignore_unused_variable_warning(c,b);
   int i;
   CostMap cost;
   ArbMap arb;