Index: concepts.hpp
===================================================================
RCS file: /cvsroot/boost/boost/boost/regex/concepts.hpp,v
retrieving revision 1.9
diff -r1.9 concepts.hpp
71c71,75
<    template<> struct char_traits<boost::char_architype>{};
---
>    template<> struct char_traits<boost::char_architype>{
> #if defined(__DECCXX) && BOOST_WORKAROUND(_RWSTD_VER, >= 0x0203)
>      typedef boost::char_architype char_type;
> #endif
>    };