diff --git a/boost/config/no_tr1/functional.hpp b/boost/config/no_tr1/functional.hpp
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+++ b/boost/config/no_tr1/functional.hpp
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+//  (C) Copyright John Maddock 2005.
+//  Use, modification and distribution are subject to 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)
+//
+// The aim of this header is just to include <functional> but to do
+// so in a way that does not result in recursive inclusion of
+// the Boost TR1 components if boost/tr1/tr1/functional is in the
+// include search path.  We have to do this to avoid circular
+// dependencies:
+//
+
+#ifndef BOOST_CONFIG_FUNCTIONAL
+#  define BOOST_CONFIG_FUNCTIONAL
+
+#  ifndef BOOST_TR1_NO_RECURSION
+#     define BOOST_TR1_NO_RECURSION
+#     define BOOST_CONFIG_NO_FUNCTIONAL_RECURSION
+#  endif
+
+#  include <functional>
+
+#  ifdef BOOST_CONFIG_NO_FUNCTIONAL_RECURSION
+#     undef BOOST_TR1_NO_RECURSION
+#     undef BOOST_CONFIG_NO_FUNCTIONAL_RECURSION
+#  endif
+
+#endif