[Boost-users] [filesystem] strange linker error

Using the 1.36 beta libs on OS X and linking to libboost_system- gcc40-1_36.a and libboost_filesystem-gcc40-1_36.a I get : "boost::system::error_code::message() const", referenced from: boost::system::system_error::what() constin main_mpi.o boost ::filesystem ::basic_filesystem_error <boost::filesystem::basic_path<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, boost::filesystem::path_traits> >::what() constin main_mpi.o ld: symbol(s) not found Any ideas what I'm doing wrong here? Matthias