Rename the extracted boost subdirectory to ndnboost
diff --git a/ndnboost/preprocessor/array/elem.hpp b/ndnboost/preprocessor/array/elem.hpp
new file mode 100644
index 0000000..22596e2
--- /dev/null
+++ b/ndnboost/preprocessor/array/elem.hpp
@@ -0,0 +1,29 @@
+# /* **************************************************************************
+# * *
+# * (C) Copyright Paul Mensonides 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 for most recent version. */
+#
+# ifndef BOOST_PREPROCESSOR_ARRAY_ELEM_HPP
+# define BOOST_PREPROCESSOR_ARRAY_ELEM_HPP
+#
+# include <ndnboost/preprocessor/array/data.hpp>
+# include <ndnboost/preprocessor/array/size.hpp>
+# include <ndnboost/preprocessor/config/config.hpp>
+# include <ndnboost/preprocessor/tuple/elem.hpp>
+#
+# /* BOOST_PP_ARRAY_ELEM */
+#
+# if ~BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_EDG()
+# define BOOST_PP_ARRAY_ELEM(i, array) BOOST_PP_TUPLE_ELEM(BOOST_PP_ARRAY_SIZE(array), i, BOOST_PP_ARRAY_DATA(array))
+# else
+# define BOOST_PP_ARRAY_ELEM(i, array) BOOST_PP_ARRAY_ELEM_I(i, array)
+# define BOOST_PP_ARRAY_ELEM_I(i, array) BOOST_PP_TUPLE_ELEM(BOOST_PP_ARRAY_SIZE(array), i, BOOST_PP_ARRAY_DATA(array))
+# endif
+#
+# endif