Hi there, I'm working against the trunk but the following program doesn't run properly. #include <iostream> #include <boost/program_options.hpp> using namespace std; namespace po = boost::program_options; int main(int argc, char* argv[]) { string input; po::options_description desc("Allowed options"); desc.add_options() ( "help,h" , "produce help message" ) ( "input,i" , po::value<string>( &input ), "Input File" ); po::variables_map vm; po::store( po::parse_command_line(argc, argv, desc), vm ); po::notify( vm ); if( vm.count( "help" )) { cout << desc << endl; return 1; } } When calling po::store() I get an assertion saying: "Expression: map/set iterators incompatible". My command line parameter is "--help". I'm using autolink and MSVC 2005. Regards, Christian