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From: Mike Gilbert <floppym@gentoo.org>
Date: Tue, 10 May 2016 22:19:00 -0400
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Subject: Re: [gentoo-dev] [PATCH] ebuild-writing/variables: better describe ROOT
To: Gentoo Dev <gentoo-dev@lists.gentoo.org>
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On Tue, May 10, 2016 at 9:42 PM, Mike Gilbert <floppym@gentoo.org> wrote:
>> Anywhere that you need addpredict() it also seems reasonable. The
>> v4l-dvb-saa716x ebuilds use "${ROOT}/usr/src/linux/" where EPREFIX would
>> not be a good replacement.
>
> Nah, usually addpredict is dealing with stuff in the system that is
> performing the build. Sandboxed phases should never be looking at
> ROOT.
>
> Those ebuilds should probably do addpredict /usr/src/linux instead.

Oh, I see. It's compiling kernel modules based on linux sources
installed in ROOT. Given the definition in PMS, I would say that's
undefined behavior at best.

I think SYSROOT might be a better fit here.