> +(define-public python2-libtorrent > + (package > + (inherit libtorrent-rasterbar) > + (name "python2-libtorrent") > + (build-system python-build-system) > + (arguments `(#:python ,python-2)) > + (synopsis "python bindings for libtorrent"))) Strange way to do that. Does this bundle libtorrent-rasterbar? Please unbundle it. (Try (delete-file-recursively "src") and then build the python bindings, with libtorrent-rasterbar in inputs)