diff --git a/ndnboost/mpl/aux_/preprocessed/bcc_pre590/equal_to.hpp b/ndnboost/mpl/aux_/preprocessed/bcc_pre590/equal_to.hpp
new file mode 100644
index 0000000..b47c51e
--- /dev/null
+++ b/ndnboost/mpl/aux_/preprocessed/bcc_pre590/equal_to.hpp
@@ -0,0 +1,94 @@
+
+// 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 the main "equal_to.hpp" header
+// -- DO NOT modify by hand!
+
+namespace ndnboost { namespace mpl {
+
+template<
+      typename Tag1
+    , typename Tag2
+    >
+struct equal_to_impl
+    : if_c<
+          ( BOOST_MPL_AUX_NESTED_VALUE_WKND(int, Tag1)
+              > BOOST_MPL_AUX_NESTED_VALUE_WKND(int, Tag2)
+            )
+
+        , aux::cast2nd_impl< equal_to_impl< Tag1,Tag1 >,Tag1, Tag2 >
+        , aux::cast1st_impl< equal_to_impl< Tag2,Tag2 >,Tag1, Tag2 >
+        >::type
+{
+};
+
+/// for Digital Mars C++/compilers with no CTPS/TTP support
+template<> struct equal_to_impl< na,na >
+{
+    template< typename U1, typename U2 > struct apply
+    {
+        typedef apply type;
+        BOOST_STATIC_CONSTANT(int, value  = 0);
+    };
+};
+
+template< typename Tag > struct equal_to_impl< na,Tag >
+{
+    template< typename U1, typename U2 > struct apply
+    {
+        typedef apply type;
+        BOOST_STATIC_CONSTANT(int, value  = 0);
+    };
+};
+
+template< typename Tag > struct equal_to_impl< Tag,na >
+{
+    template< typename U1, typename U2 > struct apply
+    {
+        typedef apply type;
+        BOOST_STATIC_CONSTANT(int, value  = 0);
+    };
+};
+
+template< typename T > struct equal_to_tag
+{
+    typedef typename T::tag type;
+};
+
+template<
+      typename BOOST_MPL_AUX_NA_PARAM(N1)
+    , typename BOOST_MPL_AUX_NA_PARAM(N2)
+    >
+struct equal_to
+
+    : equal_to_impl<
+          typename equal_to_tag<N1>::type
+        , typename equal_to_tag<N2>::type
+        >::template apply< N1,N2 >::type
+{
+    BOOST_MPL_AUX_LAMBDA_SUPPORT(2, equal_to, (N1, N2))
+
+};
+
+BOOST_MPL_AUX_NA_SPEC2(2, 2, equal_to)
+
+}}
+
+namespace ndnboost { namespace mpl {
+
+template<>
+struct equal_to_impl< integral_c_tag,integral_c_tag >
+{
+    template< typename N1, typename N2 > struct apply
+
+        : bool_< ( BOOST_MPL_AUX_VALUE_WKND(N1)::value  == BOOST_MPL_AUX_VALUE_WKND(N2)::value ) >
+    {
+    };
+};
+
+}}