Hello, I need som help. I'm building boost on my Mac OSX 10.8 using the bjam build system. I have installed Python 3.3 seperatly aas it doesn't ship with the Mac. So I have my project-config.jam file like: # Boost.Build Configuration # Automatically generated by bootstrap.sh import option ; import feature ; if ! darwin in [ feature.values <toolset> ] { using darwin ; } project : default-build <toolset>darwin ; # Python configuration using python : 3.3 : /Library/Frameworks/Python.framework/Versions/3.3 : /Library/Frameworks/Python.framework/Versions/3.3/Headers : /Library/Frameworks/Python.framework/Versions/3.3/lib ; libraries = --with-python ; option.set prefix : /usr/local ; option.set exec-prefix : /usr/local ; option.set libdir : /usr/local/lib ; option.set includedir : /usr/local/include ; # Stop on first error option.set keep-going : false ; I'm not used to Mac but I think it compiles but during linking I get the following error: Undefined symbols for architecture x86_64: "_PyInt_AsLong", referenced from: boost::python::detail::list_base::count(boost::python::api::object const&) constin list.o boost::python::detail::list_base::index(boost::python::api::object const&) constin list.o boost::python::detail::list_base::insert(boost::python::api::object const&, boost::python::api::object const&)in list.o "_PyInt_FromLong", referenced from: boost::python::detail::returnable<boost::python::api::object>::type boost::python::call<boost::python::api::object, boost::python::api::object, long>(_object*, boost::python::api::object const&, long const&, boost::type<boost::python::api::object>*)in numeric.o boost::python::detail::returnable<boost::python::api::object>::type boost::python::call<boost::python::api::object, long, long>(_object*, long const&, long const&, boost::type<boost::python::api::object>*)in numeric.o boost::python::detail::returnable<boost::python::api::object>::type boost::python::call<boost::python::api::object, long, long, long>(_object*, long const&, long const&, long const&, boost::type<boost::python::api::object>*)in numeric.o boost::python::detail::returnable<boost::python::api::object>::type boost::python::call<boost::python::api::object, long>(_object*, long const&, boost::type<boost::python::api::object>*)in numeric.o boost::python::detail::list_base::pop(long)in list.o boost::python::detail::returnable<boost::python::api::object>::type boost::python::call<boost::python::api::object, long, boost::python::api::object>(_object*, long const&, boost::python::api::object const&, boost::type<boost::python::api::object>*)in list.o "_PyString_FromStringAndSize", referenced from: boost::python::numeric::(anonymous namespace)::load(bool)in numeric.o ld: symbol(s) not found for architecture x86_64 collect2: ld returned 1 exit status What is wrong? Thanks, Simon