Hi, I have problems starting out with the program_options library. Looking at the tutorial, I wanted to try out the first example metioned, first.cpp (which is located in boost_1_41_0/libs/program_options/example). But there seems to be some linking error. I try to compile it by g++ -I ~boost_1_41_0 first.cpp -o first ~/boost_1_41_0/stage/lib/libboost_program_options.a But then I get a strange error: /tmp/ccDB6KSC.o: In function `boost::program_options::basic_command_line_parser<char>::extra_parser(boost::function1, std::basic_string >, std::basic_string const&, std::allocatorboost::function_base >)': first.cpp:(.text._ZN5boost15program_options25basic_command_line_parserIcE12extra_parserENS_9function1ISt4pairISsSsERKSsSaINS_13function_baseEEEE[boost::program_options::basic_command_line_parser<char>::extra_parser(boost::function1, std::basic_string >, std::basic_string const&, std::allocatorboost::function_base >)]+0x27): undefined reference to `boost::program_options::detail::cmdline::set_additional_parser(boost::function1, std::basic_string >, std::basic_string const&, std::allocatorboost::function_base >)' collect2: ld returned 1 exit status What am I doing wrong? Thanks, Katharina