$OpenBSD: patch-boost_regex_v4_c_regex_traits_hpp,v 1.1 2010/03/30 11:01:10 robert Exp $
--- boost/regex/v4/c_regex_traits.hpp.orig	Tue Dec 22 17:25:03 2009
+++ boost/regex/v4/c_regex_traits.hpp	Thu Dec 24 14:05:47 2009
@@ -34,6 +34,12 @@ namespace std{
 }
 #endif
 
+#if defined(__OpenBSD__)
+namespace std{
+   using ::towlower;
+}
+#endif
+
 #ifdef BOOST_MSVC
 #pragma warning(push)
 #pragma warning(disable: 4103)
