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diff --git a/boost/parameter/aux_/pack/make_deduced_items.hpp b/boost/parameter/aux_/pack/make_deduced_items.hpp
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+++ b/boost/parameter/aux_/pack/make_deduced_items.hpp
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+// Copyright David Abrahams, Daniel Wallin 2003.
+// 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_PARAMETER_AUX_PACK_MAKE_DEDUCED_ITEMS_HPP
+#define BOOST_PARAMETER_AUX_PACK_MAKE_DEDUCED_ITEMS_HPP
+
+#include <boost/parameter/aux_/void.hpp>
+#include <boost/parameter/aux_/pack/deduced_item.hpp>
+#include <boost/parameter/deduced.hpp>
+#include <boost/parameter/config.hpp>
+
+#if defined(BOOST_PARAMETER_CAN_USE_MP11)
+#include <boost/mp11/utility.hpp>
+#include <type_traits>
+#else
+#include <boost/mpl/eval_if.hpp>
+#include <boost/mpl/identity.hpp>
+#include <boost/type_traits/is_same.hpp>
+#endif
+
+namespace boost { namespace parameter { namespace aux {
+
+    template <typename Spec, typename Tail>
+#if defined(BOOST_PARAMETER_CAN_USE_MP11)
+    using make_deduced_items = ::boost::mp11::mp_if<
+        ::std::is_same<Spec,::boost::parameter::void_>
+      , ::boost::mp11::mp_identity< ::boost::parameter::void_>
+      , ::boost::mp11::mp_if<
+            ::boost::parameter::aux::is_deduced<Spec>
+          , ::boost::parameter::aux::make_deduced_item<Spec,Tail>
+          , Tail
+        >
+    >;
+#else
+    struct make_deduced_items
+      : ::boost::mpl::eval_if<
+            ::boost::is_same<Spec,::boost::parameter::void_>
+          , ::boost::mpl::identity< ::boost::parameter::void_>
+          , ::boost::mpl::eval_if<
+                ::boost::parameter::aux::is_deduced<Spec>
+              , ::boost::parameter::aux::make_deduced_item<Spec,Tail>
+              , Tail
+            >
+        >
+    {
+    };
+#endif  // BOOST_PARAMETER_CAN_USE_MP11
+}}} // namespace boost::parameter::aux
+
+#endif  // include guard
+