The current regression test results show two similar failures of program_options on cw9.3 http://tinyurl.com/6ay5m The situation is the following: parsers.hpp contain: template<class charT> basic_parsed_options<charT> parse_config_file(std::basic_istream<charT>&, const options_description&); parsers.cpp contain: template<class charT> basic_parsed_options<charT> parse_config_file(std::basic_istream<charT>& is, const options_description& desc) { ........ } template BOOST_PROGRAM_OPTIONS_DECL basic_parsed_options<char> parse_config_file(std::basic_istream<char>& is, const options_description& desc); And the linker can't find the explicitly instantinated function. This happens only in _dll tests, so I'd suspect a bug in the compiler/linker. Can anybody sched the light on this? Thanks, Volodya