Hi, when I compile program_options using VC7.1 and STLport 4.6.2 I get the following errors: <snip> ...found 672 targets... ...updating 14 targets... vc-C++ bin\boost\libs\program_options\build\libboost_program_options.lib\vc-7_1-stlport\release\threading-multi\utf8_codecvt_facet.obj utf8_codecvt_facet.cpp E:\work\CommonLibs\test\boost_1_32_0\boost_1_32_0\boost\program_options\detail\utf8_codecvt_facet.hpp(70) : error C2039: 'codecvt' : is not a member of 'operator``global namespace''' E:\work\CommonLibs\test\boost_1_32_0\boost_1_32_0\boost\program_options\detail\utf8_codecvt_facet.hpp(70) : error C2873: 'codecvt' : symbol cannot be used in a using-declaration </snip> when STLport is used, BOOST_NO_STDC_NAMESPACE is defined on my machine. and then the following code fails (from program_options\detail\utf8_codecvt_facet.hpp around line 70): #elif defined(BOOST_NO_STDC_NAMESPACE) typedef std::mbstate_t mbstate_t; namespace std{ using ::codecvt; } // namespace std #endif But STLport 4.6.2 puts codecvt correctly under std... Would be great if this can be fixed for STLport users :-) Regards Ralf