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diff --git a/ext/boost/mpl/stable_partition.hpp b/ext/boost/mpl/stable_partition.hpp
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+
+#ifndef BOOST_MPL_STABLE_PARTITION_HPP_INCLUDED
+#define BOOST_MPL_STABLE_PARTITION_HPP_INCLUDED
+
+// Copyright Eric Friedman 2002-2003
+// Copyright Aleksey Gurtovoy 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)
+//
+// See http://www.boost.org/libs/mpl for documentation.
+
+// $Id: stable_partition.hpp 49267 2008-10-11 06:19:02Z agurtovoy $
+// $Date: 2008-10-11 02:19:02 -0400 (Sat, 11 Oct 2008) $
+// $Revision: 49267 $
+
+#include <boost/mpl/fold.hpp>
+#include <boost/mpl/reverse_fold.hpp>
+#include <boost/mpl/protect.hpp>
+#include <boost/mpl/aux_/partition_op.hpp>
+#include <boost/mpl/aux_/inserter_algorithm.hpp>
+#include <boost/mpl/aux_/na.hpp>
+
+namespace boost { namespace mpl {
+
+namespace aux {
+ 
+template <
+      typename Sequence
+    , typename Pred
+    , typename In
+    , typename In2
+    , typename In1 = typename if_na<In,In2>::type
+    >
+struct stable_partition_impl
+    : fold<
+          Sequence
+        , pair< typename In1::state, typename In2::state >
+        , protect< partition_op< 
+              Pred
+            , typename In1::operation
+            , typename In2::operation
+            > >
+        >
+{
+};
+
+template <
+      typename Sequence
+    , typename Pred
+    , typename In
+    , typename In2
+    , typename In1 = typename if_na<In,In2>::type
+    >
+struct reverse_stable_partition_impl
+    : reverse_fold<
+          Sequence
+        , pair< typename In1::state, typename In2::state >
+        , protect< partition_op< 
+              Pred
+            , typename In1::operation
+            , typename In2::operation
+            > >
+        >
+{
+};
+
+} // namespace aux
+
+BOOST_MPL_AUX_INSERTER_ALGORITHM_DEF(4, stable_partition)
+
+}}
+
+#endif // BOOST_MPL_STABLE_PARTITION_HPP_INCLUDED