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From: Martin Vaeth <martin@mvath.de>
Subject: [gentoo-dev] Re: News Item: Portage Dynamic Deps
Date: Wed, 24 Jan 2018 10:31:03 +0000 (UTC)
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Rich Freeman <rich0@gentoo.org> wrote:
>
> It would already be broken on any PMS-compliant package manager

No, it is solely the interpretation of the package manager.
PMS does not specify what information is stored in /var/db
or how that information is used.