diff -r 157427808b40 -r 761fe0846f49 lemon/concepts/graph_components.h
--- a/lemon/concepts/graph_components.h	Fri Aug 24 15:37:23 2012 +0200
+++ b/lemon/concepts/graph_components.h	Thu Sep 13 11:45:36 2012 +0200
@@ -494,6 +494,8 @@
           _GraphItemIt it2;
           _GraphItemIt it3 = it1;
           _GraphItemIt it4 = INVALID;
+          ignore_unused_variable_warning(it3);
+          ignore_unused_variable_warning(it4);
 
           it2 = ++it1;
           ++it2 = it1;
@@ -583,6 +585,8 @@
           _GraphIncIt it2;
           _GraphIncIt it3 = it1;
           _GraphIncIt it4 = INVALID;
+          ignore_unused_variable_warning(it3);
+          ignore_unused_variable_warning(it4);
 
           it2 = ++it1;
           ++it2 = it1;