diff -r b1744d7bdb47 -r 426a704d7483 lemon/concepts/path.h
--- a/lemon/concepts/path.h	Wed Jan 11 14:12:36 2012 +0100
+++ b/lemon/concepts/path.h	Fri Jan 20 19:23:48 2012 +0100
@@ -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() {}
       };
 
     }