cstddef needed to be included.

[[Imported from SVN: r267]]

istl/localindex.hh

@@ -2,10 +2,11 @@
 // vi: set et ts=4 sw=2 sts=2:
 // $Id$
 
-#ifndef DUNE_LOCALINDEX_HH
-#define DUNE_LOCALINDEX_HH
+#ifndef DUNE_ISTL_LOCALINDEX_HH
+#define DUNE_ISTL_LOCALINDEX_HH
 
 #include "config.h"
+#include <cstddef>
 
 namespace Dune
 {