make.conf writing is broken and package.use support incomplete. Last release in 2013. Attempted unsuccessfully fixing it in 2017. Use an editor instead.
The bug has been referenced in the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=a4b0ab733076b53e0db3a8b5f787364390055b36 commit a4b0ab733076b53e0db3a8b5f787364390055b36 Author: Michał Górny <mgorny@gentoo.org> AuthorDate: 2022-12-25 14:05:34 +0000 Commit: Michał Górny <mgorny@gentoo.org> CommitDate: 2022-12-25 14:09:50 +0000 package.mask: Last rite app-portage/flaggie Bug: https://bugs.gentoo.org/888423 Signed-off-by: Michał Górny <mgorny@gentoo.org> profiles/package.mask | 7 +++++++ 1 file changed, 7 insertions(+)
Revived.