The dev-python/zstd package blocks parallel installation with dev-python/zstandard. I don't belive this is necessary. These 2 packages are in completely separate module namespaces (zstd vs. zstandard) and there should be no issue in installing both.
Apparently originates from bug 750158. I don't see dev-python/zstandard installing that file anymore, so I guess it can go.
Oh, I've disabled the C extension because of bug 774765.
The bug has been closed via the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=fa9c7ec7e40b718ac3017296d95ec8a111c7556d commit fa9c7ec7e40b718ac3017296d95ec8a111c7556d Author: Michał Górny <mgorny@gentoo.org> AuthorDate: 2022-03-21 21:24:48 +0000 Commit: Michał Górny <mgorny@gentoo.org> CommitDate: 2022-03-21 21:24:48 +0000 dev-python/zstd: Limit zstandard blocker to old versions Modern versions of dev-python/zstandard no longer install the colliding C module, so limit the blocker to the old versions. Closes: https://bugs.gentoo.org/835750 Signed-off-by: Michał Górny <mgorny@gentoo.org> dev-python/zstd/{zstd-1.5.1.0.ebuild => zstd-1.5.1.0-r1.ebuild} | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)