Both packages install the binary sg_write_buffer, one in /usr/bin and the other in /usr/bin. This results in a file collision on merged-usr systems.
The bug has been closed via the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=bc74f68bad931feebbdde38823ee46387ce00b77 commit bc74f68bad931feebbdde38823ee46387ce00b77 Author: Mike Gilbert <floppym@gentoo.org> AuthorDate: 2022-11-13 01:46:55 +0000 Commit: Mike Gilbert <floppym@gentoo.org> CommitDate: 2022-11-13 01:49:39 +0000 sys-fs/f2fs-tools: remove /usr/sbin/sg_write_buffer Closes: https://bugs.gentoo.org/880899 Signed-off-by: Mike Gilbert <floppym@gentoo.org> .../{f2fs-tools-1.15.0-r1.ebuild => f2fs-tools-1.15.0-r2.ebuild} | 3 +++ sys-fs/f2fs-tools/f2fs-tools-9999.ebuild | 3 +++ 2 files changed, 6 insertions(+)