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diff --git a/ext/boost/mpl/zip_view.hpp b/ext/boost/mpl/zip_view.hpp
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+
+#ifndef BOOST_MPL_ZIP_VIEW_HPP_INCLUDED
+#define BOOST_MPL_ZIP_VIEW_HPP_INCLUDED
+
+// Copyright Aleksey Gurtovoy 2000-2002
+// Copyright David Abrahams 2000-2002
+//
+// 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: zip_view.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/transform.hpp>
+#include <boost/mpl/begin_end.hpp>
+#include <boost/mpl/iterator_tags.hpp>
+#include <boost/mpl/next.hpp>
+#include <boost/mpl/lambda.hpp>
+#include <boost/mpl/deref.hpp>
+#include <boost/mpl/aux_/na_spec.hpp>
+
+namespace boost { namespace mpl {
+
+template< typename IteratorSeq >
+struct zip_iterator
+{
+    typedef forward_iterator_tag category;
+    typedef typename transform1<
+          IteratorSeq
+        , deref<_1>
+        >::type type;
+
+    typedef zip_iterator<
+          typename transform1<
+                IteratorSeq
+              , mpl::next<_1>
+            >::type
+        > next;
+};
+
+template<
+      typename BOOST_MPL_AUX_NA_PARAM(Sequences)
+    >
+struct zip_view
+{
+ private:
+    typedef typename transform1< Sequences, mpl::begin<_1> >::type first_ones_;
+    typedef typename transform1< Sequences, mpl::end<_1> >::type last_ones_;
+    
+ public:
+    typedef nested_begin_end_tag tag;
+    typedef zip_iterator<first_ones_> begin;
+    typedef zip_iterator<last_ones_> end;
+};
+
+BOOST_MPL_AUX_NA_SPEC(1, zip_view)
+
+}}
+
+#endif // BOOST_MPL_ZIP_VIEW_HPP_INCLUDED