diff -r 2c2e8df67ddc -r b9887ae63df0 lemon/concepts/maps.h
--- a/lemon/concepts/maps.h	Tue Aug 06 12:21:06 2013 +0200
+++ b/lemon/concepts/maps.h	Wed Aug 07 07:09:31 2013 +0200
@@ -60,10 +60,10 @@
           typename _ReadMap::Value own_val = m[own_key];
           own_val = m[own_key];
 
-          ignore_unused_variable_warning(key);
-          ignore_unused_variable_warning(val);
-          ignore_unused_variable_warning(own_key);
-          ignore_unused_variable_warning(own_val);
+          ::lemon::ignore_unused_variable_warning(key);
+          ::lemon::ignore_unused_variable_warning(val);
+          ::lemon::ignore_unused_variable_warning(own_key);
+          ::lemon::ignore_unused_variable_warning(own_val);
         }
         const Key& key;
         const typename _ReadMap::Key& own_key;
@@ -100,10 +100,10 @@
           m.set(key, val);
           m.set(own_key, own_val);
 
-          ignore_unused_variable_warning(key);
-          ignore_unused_variable_warning(val);
-          ignore_unused_variable_warning(own_key);
-          ignore_unused_variable_warning(own_val);
+          ::lemon::ignore_unused_variable_warning(key);
+          ::lemon::ignore_unused_variable_warning(val);
+          ::lemon::ignore_unused_variable_warning(own_key);
+          ::lemon::ignore_unused_variable_warning(own_val);
         }
         const Key& key;
         const Value& val;