Oh, hang on, I think I got it. You have compiled the C core but you haven't installed it before compiling the Python interface, right? The compiler picks up the old include file from /usr/local/include/igraph and not the new one from the freshly compiled C core, and the old include file does not include the new parameters for the isomorphism functions.
Oh, hang on, I think I got it. You have compiled the C core but you haven't installed it before compiling the Python interface, right? The compiler picks up the old include file from /usr/local/ include/ igraph and not the new one from the freshly compiled C core, and the old include file does not include the new parameters for the isomorphism functions.