Hallo! > When I create an instance of the object in PD I get: > > undefined symbol: _ZN12flext_single8AtomList3SetEiPK5_atomib > > on the console. I added now the makefiles: http://grh.mur.at/software/GApop0.1.tar.gz LG Georg PS: mail me if you would need more functionalities, because I only made it very quickly for a specific project ...