diff -r ee581a0ecfbf -r b873350e6258 lemon/concepts/path.h
--- a/lemon/concepts/path.h	Fri Jan 06 16:27:06 2012 +0100
+++ b/lemon/concepts/path.h	Thu Jan 19 15:25:06 2012 +0100
@@ -159,6 +159,7 @@
           ignore_unused_variable_warning(ed);
         }
         _Path& p;
+        PathDumperConstraints() {}
       };
 
       template <typename _Digraph, typename _Path>
@@ -184,6 +185,7 @@
           ignore_unused_variable_warning(ed);
         }
         _Path& p;
+        PathDumperConstraints() {}
       };
 
     }