ndnboost: Include boost::iostreams for internal use.
diff --git a/include/ndnboost/iostreams/detail/config/gcc.hpp b/include/ndnboost/iostreams/detail/config/gcc.hpp
new file mode 100644
index 0000000..2685346
--- /dev/null
+++ b/include/ndnboost/iostreams/detail/config/gcc.hpp
@@ -0,0 +1,27 @@
+// (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com)
+// (C) Copyright 2003-2007 Jonathan Turkanis
+// 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/iostreams for documentation.
+
+// Adapted from <ndnboost/config/auto_link.hpp> and from
+// http://www.boost.org/more/separate_compilation.html, by John Maddock.
+
+#ifndef NDNBOOST_IOSTREAMS_DETAIL_CONFIG_GCC_HPP_INCLUDED
+#define NDNBOOST_IOSTREAMS_DETAIL_CONFIG_GCC_HPP_INCLUDED
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+#include <ndnboost/config.hpp> // NDNBOOST_INTEL.
+
+#if defined(__GNUC__) && !defined(NDNBOOST_INTEL)
+# define NDNBOOST_IOSTREAMS_GCC (__GNUC__ * 100 + __GNUC_MINOR__)
+# define NDNBOOST_IOSTREAMS_GCC_WORKAROUND_GUARD 1
+#else
+# define NDNBOOST_IOSTREAMS_GCC_WORKAROUND_GUARD 0
+#endif
+
+#endif // #ifndef NDNBOOST_IOSTREAMS_DETAIL_CONFIG_GCC_HPP_INCLUDED