diff -r 97f1760dcd13 -r dd1443e4a34c lemon/concepts/bpgraph.h
--- a/lemon/concepts/bpgraph.h	Wed Aug 07 07:04:58 2013 +0200
+++ b/lemon/concepts/bpgraph.h	Wed Aug 07 07:08:38 2013 +0200
@@ -523,7 +523,10 @@
 
         /// Sets the iterator to the first arc of the given graph.
         ///
-        explicit ArcIt(const BpGraph &g) { ignore_unused_variable_warning(g); }
+        explicit ArcIt(const BpGraph &g)
+        {
+          ::lemon::ignore_unused_variable_warning(g);
+        }
         /// Sets the iterator to the given arc.
 
         /// Sets the iterator to the given arc of the given graph.
@@ -569,8 +572,8 @@
         /// Sets the iterator to the first outgoing arc of the given node.
         ///
         OutArcIt(const BpGraph& n, const Node& g) {
-          ignore_unused_variable_warning(n);
-          ignore_unused_variable_warning(g);
+          ::lemon::ignore_unused_variable_warning(n);
+          ::lemon::ignore_unused_variable_warning(g);
         }
         /// Sets the iterator to the given arc.
 
@@ -617,8 +620,8 @@
         /// Sets the iterator to the first incoming arc of the given node.
         ///
         InArcIt(const BpGraph& g, const Node& n) {
-          ignore_unused_variable_warning(n);
-          ignore_unused_variable_warning(g);
+          ::lemon::ignore_unused_variable_warning(n);
+          ::lemon::ignore_unused_variable_warning(g);
         }
         /// Sets the iterator to the given arc.