dev-python/pyifp apparently requires dev-lang/swig as a dependency because attempting to emerge it on a system without swig yields: >>> Compiling source in /var/tmp/portage/pyifp-0.2.2/work/pyifp-0.2.2 ... running build running build_py creating build creating build/lib.linux-x86_64-2.4 copying ifp.py -> build/lib.linux-x86_64-2.4 copying usb_core.py -> build/lib.linux-x86_64-2.4 copying ifp_core.py -> build/lib.linux-x86_64-2.4 running build_ext building '_usb_core' extension swig -v -python -ISWIG -shadow -o usb_core.c usb_core.i unable to execute swig: No such file or directory error: command 'swig' failed with exit status 1 pyifp is required by ifp-gnome, so emerging ifp-gnome also fails.
Dependency added, thanks.