The current version uses `REQUIRED_USE="${PYTHON_REQUIRED_USE} python? ( introspection )"`, meaning that it'll check at least one Python implementation has been enabled even if `python` USE flag is not enabled! The correct way is to use `REQUIRED_USE="python? ( ${PYTHON_REQUIRED_USE} )"` Reproducible: Always
Thanks for your report, fixed in git commit 7882e73b161e091c098dcd2dbf8071df48020930