Having a problem getting the following to compile under a Linux system (Mint 17.2, boost 1.54). It works okay with MSVC2010 and boost 1.57 though. **begin: main.cpp** #include namespace fs = boost::filesystem; #include namespace po = boost::program_options; void test(fs::path& cfg_path, po::options_description& cfg_desc, po::variables_map& options) { po::store(po::parse_config_file(fs::ifstream(cfg_path), cfg_desc, true), options); } **end: main.cpp** Is this just a problem with 1.54's version of filesystem and/or program options? Scott **begin: GCC output** main.cpp: In function ‘void test(boost::filesystem::path&, boost::program_options::options_description&, boost::program_options::variables_map&)’: main.cpp:8:72: error: no matching function for call to ‘parse_config_file(boost::filesystem::ifstream, boost::program_options::options_description&, bool)’ po::store(po::parse_config_file(fs::ifstream(cfg_path), cfg_desc, true), options); ^ main.cpp:8:72: note: candidates are: In file included from /usr/include/boost/program_options.hpp:17:0, from main.cpp:3: /usr/include/boost/program_options/parsers.hpp:185:5: note: boost::program_options::basic_parsed_options<charT> boost::program_options::parse_config_file(std::basic_istream<charT>&, const boost::program_options::options_description&, bool) [with charT = char] parse_config_file(std::basic_istream<charT>&, const options_description&, ^ /usr/include/boost/program_options/parsers.hpp:185:5: note: no known conversion for argument 1 from ‘boost::filesystem::ifstream {aka boost::filesystem::basic_ifstream<char>}’ to ‘std::basic_istream<char>&’ /usr/include/boost/program_options/parsers.hpp:198:5: note: template<class charT> boost::program_options::basic_parsed_options<charT> boost::program_options::parse_config_file(const char*, const boost::program_options::options_description&, bool) parse_config_file(const char* filename, const options_description&, ^ /usr/include/boost/program_options/parsers.hpp:198:5: note: template argument deduction/substitution failed: main.cpp:8:72: note: cannot convert ‘boost::filesystem::basic_ifstream<char>((*(const boost::filesystem::path*)cfg_path))’ (type ‘boost::filesystem::ifstream {aka boost::filesystem::basic_ifstream<char>}’) to type ‘const char*’ po::store(po::parse_config_file(fs::ifstream(cfg_path), cfg_desc, true), options); ^ **end: GCC output**