CMakeFiles/sauer_server.dir/hopmod/core_bindings.cpp.o: In function `int lua::free_func_wrapper<bool (*)(int, char const*), boost::function_traits<bool (int, char const*)> >(lua_State*, lua::wrapper_return_tag<boost::function_traits<bool (int, char const*)>::result_type, boost::function_traits<bool (int, char const*)> >, lua::arity_tag<2>)':
core_bindings.cpp:(.text._ZN3lua17free_func_wrapperIPFbiPKcEN5boost15function_traitsIS3_EEEEiP9lua_StateNS_18wrapper_return_tagINT0_11result_typeESB_EENS_9arity_tagILi2EEE[int lua::free_func_wrapper<bool (*)(int, char const*), boost::function_traits<bool (int, char const*)> >(lua_State*, lua::wrapper_return_tag<boost::function_traits<bool (int, char const*)>::result_type, boost::function_traits<bool (int, char const*)> >, lua::arity_tag<2>)]+0x1c): undefined reference to `lua_touserdata'