[boost] program options (consider using BOOST_THROW_EXCEPTION)

Hi boost, At version 1.49.0 In testing command line with known unknowns such as -V a location unknown exception is thrown from inside program_options recommending to use BOOST_THROW_EXCEPTION. I've been trying to find this and apply BOOST_THROW_EXCEPTION to eliminate the verbosity for users: ---- Command line incorrect: Throw location unknown (consider using BOOST_THROW_EXCEPTION) Dynamic exception type: boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<boost::program_options::unknown_option>

std::exception::what: unknown option -V ---- With this fixed then it'd be closer to: -------- Command line incorrect: unknown option -V -------- Yet I haven't found where. Baffled. Any hint?