Hello. PYTHON_REQ_USE for streamlink should have 'xml': https://github.com/streamlink/streamlink/blob/0.1.0/src/streamlink/plugin/api/validate.py#L19 PYTHON_REQ_USE for streamlink should have 'threads': https://github.com/streamlink/streamlink/blob/0.1.0/src/streamlink/stream/wrappers.py#L3 Please fix.
Only 0.1.0 is affected now.
Fixed in new version https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=3d599eb34b8863664dcf6b02ffe6da7b681e3a31