Updated to python 3.6 and have this output in terminal. [ebuild R ] dev-libs/protobuf-3.1.0 PYTHON_TARGETS="-python3_4*"
dev-libs/protobuf still has some issues with python 3.6. https://github.com/google/protobuf/issues/2974 https://github.com/google/protobuf/issues/3037
>=dev-python/protobuf-python-3.3.0-r1 already supports CPython 3.6.