diff -r b1744d7bdb47 -r 426a704d7483 lemon/bfs.h
--- a/lemon/bfs.h	Wed Jan 11 14:12:36 2012 +0100
+++ b/lemon/bfs.h	Fri Jan 20 19:23:48 2012 +0100
@@ -1251,6 +1251,7 @@
         visitor.examine(arc);
       }
       _Visitor& visitor;
+      Constraints() {}
     };
   };
 #endif