hi, > i've included -L/path/to/m_pd.h in the makefile the path to an include should be set at compiling stage with : -I/path/to/m_pd.h, then the path to the library is set at the linking stage with the following options : -L/path/to/libOSC.so -lOSC this, on any compiler/linker. regards, sevy/yves