Same config patch as for the top-level detail/utf8 header: cvs diff -u -wb -- boost\iostreams\detail\config\codecvt.hpp (in directory E:\sourceforge\devel\boost\) Index: boost/iostreams/detail/config/codecvt.hpp =================================================================== RCS file: /cvsroot/boost/boost/boost/iostreams/detail/config/codecvt.hpp,v retrieving revision 1.3 diff -u -w -b -r1.3 codecvt.hpp --- boost/iostreams/detail/config/codecvt.hpp 1 Jun 2005 19:13:15 -0000 1.3 +++ boost/iostreams/detail/config/codecvt.hpp 21 Jan 2006 19:39:20 -0000 @@ -63,7 +63,7 @@ #if defined(__LIBCOMO__) using ::mbstate_t; -#elif defined(BOOST_DINKUMWARE_STDLIB) +#elif defined(BOOST_DINKUMWARE_STDLIB) && !defined(__BORLANDC__) using ::mbstate_t; #elif defined(__SGI_STL_PORT) #elif defined(BOOST_NO_STDC_NAMESPACE) -- AlisdairM