Not sure who is maintainer of this file? Anyway, following patch is a little rough, not testing on compiler version, but is required for the current Borland compiler and the Dinkumware libraries it ships with. Fixing this should fix tests across a few libraries: cvs diff -u -wb -- boost\detail\utf8_codecvt_facet.hpp (in directory E:\sourceforge\devel\boost\) Index: boost/detail/utf8_codecvt_facet.hpp =================================================================== RCS file: /cvsroot/boost/boost/boost/detail/utf8_codecvt_facet.hpp,v retrieving revision 1.3 diff -u -w -b -r1.3 utf8_codecvt_facet.hpp --- boost/detail/utf8_codecvt_facet.hpp 20 Jan 2006 16:53:30 -0000 1.3 +++ boost/detail/utf8_codecvt_facet.hpp 21 Jan 2006 19:29:24 -0000 @@ -92,7 +92,7 @@ namespace std { #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) ***** CVS exited normally with code 1 ***** -- AlisdairM