diff --git a/boost/mpl/aux_/na_spec.hpp b/boost/mpl/aux_/na_spec.hpp
new file mode 100644
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--- /dev/null
+++ b/boost/mpl/aux_/na_spec.hpp
@@ -0,0 +1,175 @@
+
+#ifndef BOOST_MPL_AUX_NA_SPEC_HPP_INCLUDED
+#define BOOST_MPL_AUX_NA_SPEC_HPP_INCLUDED
+
+// Copyright Aleksey Gurtovoy 2001-2004
+//
+// 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: na_spec.hpp 49267 2008-10-11 06:19:02Z agurtovoy $
+// $Date: 2008-10-10 23:19:02 -0700 (Fri, 10 Oct 2008) $
+// $Revision: 49267 $
+
+#if !defined(BOOST_MPL_PREPROCESSING_MODE)
+#   include <boost/mpl/lambda_fwd.hpp>
+#   include <boost/mpl/int.hpp>
+#   include <boost/mpl/bool.hpp>
+#   include <boost/mpl/aux_/na.hpp>
+#   include <boost/mpl/aux_/arity.hpp>
+#   include <boost/mpl/aux_/template_arity_fwd.hpp>
+#endif
+
+#include <boost/mpl/aux_/preprocessor/params.hpp>
+#include <boost/mpl/aux_/preprocessor/enum.hpp>
+#include <boost/mpl/aux_/preprocessor/def_params_tail.hpp>
+#include <boost/mpl/aux_/lambda_arity_param.hpp>
+#include <boost/mpl/aux_/config/dtp.hpp>
+#include <boost/mpl/aux_/config/eti.hpp>
+#include <boost/mpl/aux_/nttp_decl.hpp>
+#include <boost/mpl/aux_/config/ttp.hpp>
+#include <boost/mpl/aux_/config/lambda.hpp>
+#include <boost/mpl/aux_/config/overload_resolution.hpp>
+
+
+#define BOOST_MPL_AUX_NA_PARAMS(i) \
+    BOOST_MPL_PP_ENUM(i, na) \
+/**/
+
+#if defined(BOOST_MPL_CFG_BROKEN_DEFAULT_PARAMETERS_IN_NESTED_TEMPLATES)
+#   define BOOST_MPL_AUX_NA_SPEC_ARITY(i, name) \
+namespace aux { \
+template< BOOST_MPL_AUX_NTTP_DECL(int, N) > \
+struct arity< \
+          name< BOOST_MPL_AUX_NA_PARAMS(i) > \
+        , N \
+        > \
+    : int_< BOOST_MPL_LIMIT_METAFUNCTION_ARITY > \
+{ \
+}; \
+} \
+/**/
+#else
+#   define BOOST_MPL_AUX_NA_SPEC_ARITY(i, name) /**/
+#endif
+
+#define BOOST_MPL_AUX_NA_SPEC_MAIN(i, name) \
+template<> \
+struct name< BOOST_MPL_AUX_NA_PARAMS(i) > \
+{ \
+    template< \
+          BOOST_MPL_PP_PARAMS(i, typename T) \
+        BOOST_MPL_PP_NESTED_DEF_PARAMS_TAIL(i, typename T, na) \
+        > \
+    struct apply \
+        : name< BOOST_MPL_PP_PARAMS(i, T) > \
+    { \
+    }; \
+}; \
+/**/
+
+#if defined(BOOST_MPL_CFG_NO_FULL_LAMBDA_SUPPORT)
+#   define BOOST_MPL_AUX_NA_SPEC_LAMBDA(i, name) \
+template<> \
+struct lambda< \
+      name< BOOST_MPL_AUX_NA_PARAMS(i) > \
+    , void_ \
+    , true_ \
+    > \
+{ \
+    typedef false_ is_le; \
+    typedef name< BOOST_MPL_AUX_NA_PARAMS(i) > type; \
+}; \
+template<> \
+struct lambda< \
+      name< BOOST_MPL_AUX_NA_PARAMS(i) > \
+    , void_ \
+    , false_ \
+    > \
+{ \
+    typedef false_ is_le; \
+    typedef name< BOOST_MPL_AUX_NA_PARAMS(i) > type; \
+}; \
+/**/
+#else
+#   define BOOST_MPL_AUX_NA_SPEC_LAMBDA(i, name) \
+template< typename Tag > \
+struct lambda< \
+      name< BOOST_MPL_AUX_NA_PARAMS(i) > \
+    , Tag \
+    BOOST_MPL_AUX_LAMBDA_ARITY_PARAM(int_<-1>) \
+    > \
+{ \
+    typedef false_ is_le; \
+    typedef name< BOOST_MPL_AUX_NA_PARAMS(i) > result_; \
+    typedef name< BOOST_MPL_AUX_NA_PARAMS(i) > type; \
+}; \
+/**/
+#endif
+
+#if defined(BOOST_MPL_CFG_EXTENDED_TEMPLATE_PARAMETERS_MATCHING) \
+    || defined(BOOST_MPL_CFG_NO_FULL_LAMBDA_SUPPORT) \
+        && defined(BOOST_MPL_CFG_BROKEN_OVERLOAD_RESOLUTION)
+#   define BOOST_MPL_AUX_NA_SPEC_TEMPLATE_ARITY(i, j, name) \
+namespace aux { \
+template< BOOST_MPL_PP_PARAMS(j, typename T) > \
+struct template_arity< \
+          name< BOOST_MPL_PP_PARAMS(j, T) > \
+        > \
+    : int_<j> \
+{ \
+}; \
+\
+template<> \
+struct template_arity< \
+          name< BOOST_MPL_PP_ENUM(i, na) > \
+        > \
+    : int_<-1> \
+{ \
+}; \
+} \
+/**/
+#else
+#   define BOOST_MPL_AUX_NA_SPEC_TEMPLATE_ARITY(i, j, name) /**/
+#endif
+
+#if defined(BOOST_MPL_CFG_MSVC_ETI_BUG)
+#   define BOOST_MPL_AUX_NA_SPEC_ETI(i, name) \
+template<> \
+struct name< BOOST_MPL_PP_ENUM(i, int) > \
+{ \
+    typedef int type; \
+    enum { value = 0 }; \
+}; \
+/**/
+#else
+#   define BOOST_MPL_AUX_NA_SPEC_ETI(i, name) /**/
+#endif
+
+#define BOOST_MPL_AUX_NA_PARAM(param) param = na
+
+#define BOOST_MPL_AUX_NA_SPEC_NO_ETI(i, name) \
+BOOST_MPL_AUX_NA_SPEC_MAIN(i, name) \
+BOOST_MPL_AUX_NA_SPEC_LAMBDA(i, name) \
+BOOST_MPL_AUX_NA_SPEC_ARITY(i, name) \
+BOOST_MPL_AUX_NA_SPEC_TEMPLATE_ARITY(i, i, name) \
+/**/
+
+#define BOOST_MPL_AUX_NA_SPEC(i, name) \
+BOOST_MPL_AUX_NA_SPEC_NO_ETI(i, name) \
+BOOST_MPL_AUX_NA_SPEC_ETI(i, name) \
+/**/
+
+#define BOOST_MPL_AUX_NA_SPEC2(i, j, name) \
+BOOST_MPL_AUX_NA_SPEC_MAIN(i, name) \
+BOOST_MPL_AUX_NA_SPEC_ETI(i, name) \
+BOOST_MPL_AUX_NA_SPEC_LAMBDA(i, name) \
+BOOST_MPL_AUX_NA_SPEC_ARITY(i, name) \
+BOOST_MPL_AUX_NA_SPEC_TEMPLATE_ARITY(i, j, name) \
+/**/
+
+
+#endif // BOOST_MPL_AUX_NA_SPEC_HPP_INCLUDED