Hello, I had a very similar problem. I tried to build date_time of Boost 1.32.0 without native-wchar_t support of the Microsoft Visual C++ 7.1 Compiler. Here is the bjam command line: bjam -sTOOLS=vc-7_1 "-sBUILD=debug off" --with-date_time The build results show the following error: D:\Projects\3rdParty\Boost\Boost_1_32_0\Temp\boost_1_32_0\boost\lexical_cast.hpp(150) : error C2679: binary '>>' : no operator found which takes a right-hand operand of type 'boost::date_time::date_names_put::string_type' (or there is no acceptable conversion) with [ Config=boost::gregorian::greg_facet_config, charT=wchar_t, OutputIterator=std::ostreambuf_iterator> ] D:\Projects\3rdParty\Boost\Boost_1_32_0\Temp\boost_1_32_0\boost\lexical_cast.hpp(189) : see reference to function template instantiation 'bool boost::detail::lexical_stream::operator >><Target>(InputStreamable &)' being compiled with [ Target=boost::date_time::date_names_put>>::string_type, Source=const char *, InputStreamable=boost::date_time::date_names_put>>::string_type ] D:\Projects\3rdParty\Boost\Boost_1_32_0\Temp\boost_1_32_0\boost\date_time\date_names_put.hpp(126) : see reference to function template instantiation 'Target boost::lexical_cast::string_type,const char*>(Source)' being compiled with [ Target=boost::date_time::date_names_put>>::string_type, Config=boost::gregorian::greg_facet_config, charT=wchar_t, OutputIterator=std::ostreambuf_iterator>, Source=const char * ] D:\Projects\3rdParty\Boost\Boost_1_32_0\Temp\boost_1_32_0\boost\date_time\date_names_put.hpp(122) : while compiling class-template member function 'void boost::date_time::date_names_put::do_put_special_value(boost::date_time::date_names_put::iter_type &,boost::date_time::date_names_put::special_value_enum) const' with [ Config=boost::gregorian::greg_facet_config, charT=wchar_t, OutputIterator=std::ostreambuf_iterator> ] D:\Projects\3rdParty\Boost\Boost_1_32_0\Temp\boost_1_32_0\boost\date_time\date_names_put.hpp(208) : see reference to class template instantiation 'boost::date_time::date_names_put' being compiled with [ Config=boost::gregorian::greg_facet_config, charT=wchar_t, OutputIterator=std::ostreambuf_iterator> ] D:\Projects\3rdParty\Boost\Boost_1_32_0\Temp\boost_1_32_0\libs\date_time\build\../src\gregorian\greg_month.cpp(129) : see reference to class template instantiation 'boost::date_time::all_date_names_put' being compiled with [ Config=boost::gregorian::greg_facet_config, charT=wchar_t ] The build with enabled native wchar_t support succeeds. I have compared the two Toolset files vc-7_1-tools.jam and vc-7_1-stlport-tools.jam. Although I'm not very familiar with jam files, I think that the native wchar_t support of the Visual C++ compiler is disabled per default in the vc-7_1-stlport Toolset. vc-7_1-tools.jam: ... feature native-wchar_t : on off ; ... vc-7_1-stlport-tools.jam: ... feature native-wchar_t : off on ; ... If I set the BOOST_NO_STD_WSTRING macro - like Jeff suggest - the build without native wchar_t support succeeds. Regards, Jochen.