diff --git a/include/boost/pending/cstddef.hpp b/include/boost/pending/cstddef.hpp
new file mode 100644
index 0000000..440629e
--- /dev/null
+++ b/include/boost/pending/cstddef.hpp
@@ -0,0 +1,16 @@
+// -*- C++ -*- forwarding header.
+//  (C) Copyright Jeremy Siek 2004 
+//  Distributed under the Boost Software License, Version 1.0. (See
+//  accompanying file LICENSE_1_0.txt or copy at
+//  http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef BOOST_CSTDDEF_HPP
+#define BOOST_CSTDDEF_HPP
+
+#if defined(__sgi) && !defined(__GNUC__)
+# include <stddef.h>
+#else
+# include <cstddef>
+#endif
+
+#endif