> Is this not in portage, not in the world file or what?
>
> Installed packages with a version not in the database (or masked):

The "database" is what is produced by update-eix, i.e. usually
the portage tree and your overlays (and perhaps "virtual" overlays).
So, as a rule, it means that you have at least one version of these
packages installed which was erased from the portage tree (and isn't
in your overlays either).
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gentoo-user@(protected)