dev-libs/libnl-3.2.22-r1 needs DEPEND="python? ( dev-lang/swig )". There are 2 calls to swig: swig -python -O -nodefaultctor -o netlink/capi_wrap.c netlink/capi.i swig -python -O -nodefaultctor -o netlink/route/capi_wrap.c netlink/route/capi.i