ndnboost: Include boost::iostreams for internal use.
diff --git a/include/ndnboost/regex/v4/regex_fwd.hpp b/include/ndnboost/regex/v4/regex_fwd.hpp
new file mode 100644
index 0000000..e98050f
--- /dev/null
+++ b/include/ndnboost/regex/v4/regex_fwd.hpp
@@ -0,0 +1,73 @@
+/*
+ *
+ * Copyright (c) 1998-2002
+ * John Maddock
+ *
+ * Use, modification and distribution are subject to 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)
+ *
+ */
+
+ /*
+ * LOCATION: see http://www.boost.org for most recent version.
+ * FILE regex_fwd.cpp
+ * VERSION see <ndnboost/version.hpp>
+ * DESCRIPTION: Forward declares ndnboost::basic_regex<> and
+ * associated typedefs.
+ */
+
+#ifndef NDNBOOST_REGEX_FWD_HPP_INCLUDED
+#define NDNBOOST_REGEX_FWD_HPP_INCLUDED
+
+#ifndef NDNBOOST_REGEX_CONFIG_HPP
+#include <ndnboost/regex/config.hpp>
+#endif
+
+//
+// define NDNBOOST_REGEX_NO_FWD if this
+// header doesn't work!
+//
+#ifdef NDNBOOST_REGEX_NO_FWD
+# ifndef NDNBOOST_RE_REGEX_HPP
+# include <ndnboost/regex.hpp>
+# endif
+#else
+
+namespace ndnboost{
+
+template <class charT>
+class cpp_regex_traits;
+template <class charT>
+struct c_regex_traits;
+template <class charT>
+class w32_regex_traits;
+
+#ifdef NDNBOOST_REGEX_USE_WIN32_LOCALE
+template <class charT, class implementationT = w32_regex_traits<charT> >
+struct regex_traits;
+#elif defined(NDNBOOST_REGEX_USE_CPP_LOCALE)
+template <class charT, class implementationT = cpp_regex_traits<charT> >
+struct regex_traits;
+#else
+template <class charT, class implementationT = c_regex_traits<charT> >
+struct regex_traits;
+#endif
+
+template <class charT, class traits = regex_traits<charT> >
+class basic_regex;
+
+typedef basic_regex<char, regex_traits<char> > regex;
+#ifndef NDNBOOST_NO_WREGEX
+typedef basic_regex<wchar_t, regex_traits<wchar_t> > wregex;
+#endif
+
+} // namespace ndnboost
+
+#endif // NDNBOOST_REGEX_NO_FWD
+
+#endif
+
+
+
+