diff -r 2c2e8df67ddc -r b9887ae63df0 lemon/concepts/digraph.h
--- a/lemon/concepts/digraph.h	Tue Aug 06 12:21:06 2013 +0200
+++ b/lemon/concepts/digraph.h	Wed Aug 07 07:09:31 2013 +0200
@@ -312,7 +312,7 @@
 
         /// Sets the iterator to the first arc of the given digraph.
         ///
-        explicit ArcIt(const Digraph& g) { ignore_unused_variable_warning(g); }
+        explicit ArcIt(const Digraph& g) { ::lemon::ignore_unused_variable_warning(g); }
         /// Sets the iterator to the given arc.
 
         /// Sets the iterator to the given arc of the given digraph.