I kept wondering why the version number in /etc/apcupsd/apcupsd.conf was much older than my package version, and did not seem to be affected by any changes in my USE flags (as the upstream package's apcupsd.conf.in file would seem to indicate it would), then I realized the Gentoo ebuild is replacing the file generated by the upstream package's configure step with this static copy: https://gitweb.gentoo.org/repo/gentoo.git/tree/sys-power/apcupsd/files/apcupsd.conf You can see this in the ebuild's src_install(), the following line: doins "${FILESDIR}"/apcupsd.conf The static file's Git log shows it was committed first in 2015 and never updated since: https://gitweb.gentoo.org/repo/gentoo.git/log/sys-power/apcupsd/files/apcupsd.conf The log messages do not indicate why it was created, and there have been several new apcupsd versions since. Please remove this static config file and the corresponding line from the ebuild. It may also be a good time to review whether the patches are still relevant -- they all seem to be for much older apcupsd versions and maybe they're no longer necessary (or worse, are breaking thing).
The only setting in Gentoo's override config that seems to me like obviously a good idea is the override for the NISIP option. Upstream's default is 0.0.0.0, but Gentoo's override of only binding to 127.0.0.1 is safer. This could perhaps be accomplished with some kind of post-installation patch rather than a complete config replacement.
