Index: boost/range/concepts.hpp
===================================================================
--- boost/range/concepts.hpp	(revision 86799)
+++ boost/range/concepts.hpp	(working copy)
@@ -267,8 +267,8 @@
             iterator i1 = boost::begin(*m_range);
             iterator i2 = boost::end(*m_range);
 
-            ignore_unused_variable_warning(i1);
-            ignore_unused_variable_warning(i2);
+            boost::ignore_unused_variable_warning(i1);
+            boost::ignore_unused_variable_warning(i2);
 
             const_constraints(*m_range);
         }
@@ -279,8 +279,8 @@
             const_iterator ci1 = boost::begin(const_range);
             const_iterator ci2 = boost::end(const_range);
 
-            ignore_unused_variable_warning(ci1);
-            ignore_unused_variable_warning(ci2);
+            boost::ignore_unused_variable_warning(ci1);
+            boost::ignore_unused_variable_warning(ci2);
         }
 
        // Rationale: