diff -r 97f1760dcd13 -r dd1443e4a34c lemon/concepts/graph_components.h
--- a/lemon/concepts/graph_components.h	Wed Aug 07 07:04:58 2013 +0200
+++ b/lemon/concepts/graph_components.h	Wed Aug 07 07:08:38 2013 +0200
@@ -456,7 +456,7 @@
             bn = bpgraph.asBlueNodeUnsafe(bnan);
             rn = bpgraph.asRedNode(rnan);
             bn = bpgraph.asBlueNode(bnan);
-            ignore_unused_variable_warning(b);
+            ::lemon::ignore_unused_variable_warning(b);
           }
         }
 
@@ -653,8 +653,8 @@
           int bid = bpgraph.id(blue);
           rid = bpgraph.maxRedId();
           bid = bpgraph.maxBlueId();
-          ignore_unused_variable_warning(rid);
-          ignore_unused_variable_warning(bid);
+          ::lemon::ignore_unused_variable_warning(rid);
+          ::lemon::ignore_unused_variable_warning(bid);
         }
 
         const _BpGraph& bpgraph;
@@ -1387,8 +1387,8 @@
             = bpgraph.notifier(typename _BpGraph::RedNode());
           typename _BpGraph::BlueNodeNotifier& bnn
             = bpgraph.notifier(typename _BpGraph::BlueNode());
-          ignore_unused_variable_warning(rnn);
-          ignore_unused_variable_warning(bnn);
+          ::lemon::ignore_unused_variable_warning(rnn);
+          ::lemon::ignore_unused_variable_warning(bnn);
         }
 
         const _BpGraph& bpgraph;