It should support python3_9 at python_targets. Other packages also depend on a python older than 3.9, which is annoying and maybe fixable by fixing PYTHON_COMPAT at the ebuild.
The bug has been closed via the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=559078683680e113a09d36e710850c2bb1cc286f commit 559078683680e113a09d36e710850c2bb1cc286f Author: Michał Górny <mgorny@gentoo.org> AuthorDate: 2020-10-26 18:25:17 +0000 Commit: Michał Górny <mgorny@gentoo.org> CommitDate: 2020-10-26 18:31:24 +0000 app-admin/eclean-kernel: Enable py3.9 Closes: https://bugs.gentoo.org/751343 Signed-off-by: Michał Górny <mgorny@gentoo.org> app-admin/eclean-kernel/eclean-kernel-2.99.2.ebuild | 2 +- app-admin/eclean-kernel/eclean-kernel-9999.ebuild | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-)