diff --git a/ndnboost/mpl/aux_/preprocessed/gcc/fold_impl.hpp b/ndnboost/mpl/aux_/preprocessed/gcc/fold_impl.hpp
new file mode 100644
index 0000000..494cd41
--- /dev/null
+++ b/ndnboost/mpl/aux_/preprocessed/gcc/fold_impl.hpp
@@ -0,0 +1,180 @@
+
+// Copyright Aleksey Gurtovoy 2000-2004
+//
+// 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)
+//
+
+// Preprocessed version of "ndnboost/mpl/aux_/fold_impl.hpp" header
+// -- DO NOT modify by hand!
+
+namespace ndnboost { namespace mpl { namespace aux {
+
+/// forward declaration
+
+template<
+      int N
+    , typename First
+    , typename Last
+    , typename State
+    , typename ForwardOp
+    >
+struct fold_impl;
+
+template<
+      typename First
+    , typename Last
+    , typename State
+    , typename ForwardOp
+    >
+struct fold_impl< 0,First,Last,State,ForwardOp >
+{
+    typedef First iter0;
+    typedef State state0;
+    typedef state0 state;
+    typedef iter0 iterator;
+};
+
+template<
+      typename First
+    , typename Last
+    , typename State
+    , typename ForwardOp
+    >
+struct fold_impl< 1,First,Last,State,ForwardOp >
+{
+    typedef First iter0;
+    typedef State state0;
+    typedef typename apply2< ForwardOp, state0, typename deref<iter0>::type >::type state1;
+    typedef typename mpl::next<iter0>::type iter1;
+    
+
+    typedef state1 state;
+    typedef iter1 iterator;
+};
+
+template<
+      typename First
+    , typename Last
+    , typename State
+    , typename ForwardOp
+    >
+struct fold_impl< 2,First,Last,State,ForwardOp >
+{
+    typedef First iter0;
+    typedef State state0;
+    typedef typename apply2< ForwardOp, state0, typename deref<iter0>::type >::type state1;
+    typedef typename mpl::next<iter0>::type iter1;
+    typedef typename apply2< ForwardOp, state1, typename deref<iter1>::type >::type state2;
+    typedef typename mpl::next<iter1>::type iter2;
+    
+
+    typedef state2 state;
+    typedef iter2 iterator;
+};
+
+template<
+      typename First
+    , typename Last
+    , typename State
+    , typename ForwardOp
+    >
+struct fold_impl< 3,First,Last,State,ForwardOp >
+{
+    typedef First iter0;
+    typedef State state0;
+    typedef typename apply2< ForwardOp, state0, typename deref<iter0>::type >::type state1;
+    typedef typename mpl::next<iter0>::type iter1;
+    typedef typename apply2< ForwardOp, state1, typename deref<iter1>::type >::type state2;
+    typedef typename mpl::next<iter1>::type iter2;
+    typedef typename apply2< ForwardOp, state2, typename deref<iter2>::type >::type state3;
+    typedef typename mpl::next<iter2>::type iter3;
+    
+
+    typedef state3 state;
+    typedef iter3 iterator;
+};
+
+template<
+      typename First
+    , typename Last
+    , typename State
+    , typename ForwardOp
+    >
+struct fold_impl< 4,First,Last,State,ForwardOp >
+{
+    typedef First iter0;
+    typedef State state0;
+    typedef typename apply2< ForwardOp, state0, typename deref<iter0>::type >::type state1;
+    typedef typename mpl::next<iter0>::type iter1;
+    typedef typename apply2< ForwardOp, state1, typename deref<iter1>::type >::type state2;
+    typedef typename mpl::next<iter1>::type iter2;
+    typedef typename apply2< ForwardOp, state2, typename deref<iter2>::type >::type state3;
+    typedef typename mpl::next<iter2>::type iter3;
+    typedef typename apply2< ForwardOp, state3, typename deref<iter3>::type >::type state4;
+    typedef typename mpl::next<iter3>::type iter4;
+    
+
+    typedef state4 state;
+    typedef iter4 iterator;
+};
+
+template<
+      int N
+    , typename First
+    , typename Last
+    , typename State
+    , typename ForwardOp
+    >
+struct fold_impl
+{
+    typedef fold_impl<
+          4
+        , First
+        , Last
+        , State
+        , ForwardOp
+        > chunk_;
+
+    typedef fold_impl<
+          ( (N - 4) < 0 ? 0 : N - 4 )
+        , typename chunk_::iterator
+        , Last
+        , typename chunk_::state
+        , ForwardOp
+        > res_;
+
+    typedef typename res_::state state;
+    typedef typename res_::iterator iterator;
+};
+
+template<
+      typename First
+    , typename Last
+    , typename State
+    , typename ForwardOp
+    >
+struct fold_impl< -1,First,Last,State,ForwardOp >
+    : fold_impl<
+          -1
+        , typename mpl::next<First>::type
+        , Last
+        , typename apply2<ForwardOp,State, typename deref<First>::type>::type
+        , ForwardOp
+        >
+{
+};
+
+template<
+      typename Last
+    , typename State
+    , typename ForwardOp
+    >
+struct fold_impl< -1,Last,Last,State,ForwardOp >
+{
+    typedef State state;
+    typedef Last iterator;
+};
+
+}}}