diff -r 4bb9e72e1a41 -r 7fdaa05a69a1 lemon/concepts/path.h
--- a/lemon/concepts/path.h	Wed Sep 12 17:25:48 2012 +0200
+++ b/lemon/concepts/path.h	Thu Sep 13 11:56:19 2012 +0200
@@ -168,6 +168,7 @@
           ignore_unused_variable_warning(ed);
         }
         _Path& p;
+        PathDumperConstraints() {}
       };
 
       template <typename _Digraph, typename _Path>
@@ -193,6 +194,7 @@
           ignore_unused_variable_warning(ed);
         }
         _Path& p;
+        PathDumperConstraints() {}
       };
 
     }