ndnboost: Include boost::iostreams for internal use.
diff --git a/include/ndnboost/system/config.hpp b/include/ndnboost/system/config.hpp
new file mode 100644
index 0000000..2180de4
--- /dev/null
+++ b/include/ndnboost/system/config.hpp
@@ -0,0 +1,69 @@
+// ndnboost/system/config.hpp -----------------------------------------------------------//
+
+// Copyright Beman Dawes 2003, 2006
+
+// 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/system for documentation.
+
+#ifndef NDNBOOST_SYSTEM_CONFIG_HPP
+#define NDNBOOST_SYSTEM_CONFIG_HPP
+
+#include <ndnboost/config.hpp>
+#include <ndnboost/system/api_config.hpp> // for NDNBOOST_POSIX_API or NDNBOOST_WINDOWS_API
+
+// This header implements separate compilation features as described in
+// http://www.boost.org/more/separate_compilation.html
+
+// normalize macros ------------------------------------------------------------------//
+
+#if !defined(NDNBOOST_SYSTEM_DYN_LINK) && !defined(NDNBOOST_SYSTEM_STATIC_LINK) \
+ && !defined(NDNBOOST_ALL_DYN_LINK) && !defined(NDNBOOST_ALL_STATIC_LINK)
+# define NDNBOOST_SYSTEM_STATIC_LINK
+#endif
+
+#if defined(NDNBOOST_ALL_DYN_LINK) && !defined(NDNBOOST_SYSTEM_DYN_LINK)
+# define NDNBOOST_SYSTEM_DYN_LINK
+#elif defined(NDNBOOST_ALL_STATIC_LINK) && !defined(NDNBOOST_SYSTEM_STATIC_LINK)
+# define NDNBOOST_SYSTEM_STATIC_LINK
+#endif
+
+#if defined(NDNBOOST_SYSTEM_DYN_LINK) && defined(NDNBOOST_SYSTEM_STATIC_LINK)
+# error Must not define both NDNBOOST_SYSTEM_DYN_LINK and NDNBOOST_SYSTEM_STATIC_LINK
+#endif
+
+// enable dynamic or static linking as requested --------------------------------------//
+
+#if defined(NDNBOOST_ALL_DYN_LINK) || defined(NDNBOOST_SYSTEM_DYN_LINK)
+# if defined(NDNBOOST_SYSTEM_SOURCE)
+# define NDNBOOST_SYSTEM_DECL NDNBOOST_SYMBOL_EXPORT
+# else
+# define NDNBOOST_SYSTEM_DECL NDNBOOST_SYMBOL_IMPORT
+# endif
+#else
+# define NDNBOOST_SYSTEM_DECL
+#endif
+
+// enable automatic library variant selection ----------------------------------------//
+
+#if !defined(NDNBOOST_SYSTEM_SOURCE) && !defined(NDNBOOST_ALL_NO_LIB) && !defined(NDNBOOST_SYSTEM_NO_LIB)
+//
+// Set the name of our library, this will get undef'ed by auto_link.hpp
+// once it's done with it:
+//
+#define NDNBOOST_LIB_NAME ndnboost_system
+//
+// If we're importing code from a dll, then tell auto_link.hpp about it:
+//
+#if defined(NDNBOOST_ALL_DYN_LINK) || defined(NDNBOOST_SYSTEM_DYN_LINK)
+# define NDNBOOST_DYN_LINK
+#endif
+//
+// And include the header that does the work:
+//
+#include <ndnboost/config/auto_link.hpp>
+#endif // auto-linking disabled
+
+#endif // NDNBOOST_SYSTEM_CONFIG_HPP
+