Hello, I am trying to wrap a simple class that runs some image processing routines. I would like them to be script-able from python. I am not trying to pass complicated types, in fact almost all the functions take and return no arguments. Here is my wrapper code (generated with pyplusplus partially): #include "boost/python.hpp" #include "eventDetector.h" namespace bp = boost::python; BOOST_PYTHON_MODULE(pyplusplus){ { //::eventDetector typedef bp::class_< eventDetector > eventDetector_exposer_t; eventDetector_exposer_t eventDetector_exposer = eventDetector_exposer_t( "eventDetector", bp::init< params & >(( bp::arg("op") )) ); bp::scope eventDetector_scope( eventDetector_exposer ); bp::implicitly_convertible< params &, eventDetector >(); { //::eventDetector::detect typedef void ( ::eventDetector::*detect_function_type )( ) ; eventDetector_exposer.def( "detect" , detect_function_type( &::eventDetector::detect ) ); } { //::eventDetector::init typedef void ( ::eventDetector::*init_function_type )( ) ; eventDetector_exposer.def( "init" , init_function_type( &::eventDetector::init ) ); } { //::eventDetector::load typedef void ( ::eventDetector::*load_function_type )( ) ; eventDetector_exposer.def( "load" , load_function_type( &::eventDetector::load ) ); } { //::eventDetector::save typedef void ( ::eventDetector::*save_function_type )( ) ; eventDetector_exposer.def( "save" , save_function_type( &::eventDetector::save ) ); } { //::eventDetector::setGridSize typedef void ( ::eventDetector::*setGridSize_function_type )( int,int ) ; eventDetector_exposer.def( "setGridSize" , setGridSize_function_type( &::eventDetector::setGridSize ) , ( bp::arg("x"), bp::arg("y") ) ); } { //::eventDetector::setVideoCapture typedef bool ( ::eventDetector::*setVideoCapture_function_type )( ::std::string ) ; eventDetector_exposer.def( "setVideoCapture" , setVideoCapture_function_type( &::eventDetector::setVideoCapture ) , ( bp::arg("filename") ) ); } { //::eventDetector::setVideoCapture typedef bool ( ::eventDetector::*setVideoCapture_function_type )( int ) ; eventDetector_exposer.def( "setVideoCapture" , setVideoCapture_function_type( &::eventDetector::setVideoCapture ) , ( bp::arg("cam") ) ); } { //::eventDetector::train typedef void ( ::eventDetector::*train_function_type )( ) ; eventDetector_exposer.def( "train" , train_function_type( &::eventDetector::train ) ); } } bp::class_< params >( "params" ) ... large list of simple params...; } It builds fine using bjam but when I import into python I get an error message: libEventDetector.so: undefined symbol: _ZN13eventDetector4loadEv. I am really not very good with boost::python and I don't really know what to do. Help is appreciated, thank you!