This package still uses the legacy eclass code paths. These paths are deprecated and pose a significant maintenance cost. Please update the package to use PEP517 build mode. For more information, please see the Python Guide, particularly; https://projects.gentoo.org/python/guide/migration.html#migrating-to-pep-517-builds
Sorry, misfired. *** This bug has been marked as a duplicate of bug 909856 ***