diff -r cd72eae05bdf -r 3c00344f49c9 test/hao_orlin_test.cc
--- a/test/hao_orlin_test.cc	Mon Jul 16 16:21:40 2018 +0200
+++ b/test/hao_orlin_test.cc	Wed Oct 17 19:14:07 2018 +0200
@@ -2,7 +2,7 @@
  *
  * This file is a part of LEMON, a generic C++ optimization library.
  *
- * Copyright (C) 2003-2010
+ * Copyright (C) 2003-2013
  * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
  * (Egervary Research Group on Combinatorial Optimization, EGRES).
  *
@@ -66,6 +66,7 @@
   CapMap cap;
   CutMap cut;
   Value v;
+  ::lemon::ignore_unused_variable_warning(v);
 
   HaoOrlin<Digraph, CapMap> ho_test(g, cap);
   const HaoOrlin<Digraph, CapMap>&