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From: Nikos Chantziaras <realnc@gmail.com>
Subject: [gentoo-user] Re: Permissions error on starting X.
Date: Mon, 5 Nov 2018 18:27:24 +0200
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References: <20181103140151.GA5029@ACM> <prlgsb$i84$1@blaine.gmane.org>
 <prpnmk$r04$3@blaine.gmane.org>
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On 05/11/2018 17:30, Grant Edwards wrote:
> On 2018-11-04, Nikos Chantziaras <realnc@gmail.com> wrote:
>> On 03/11/2018 16:01, Alan Mackenzie wrote:
>>> The developers, in this instance, failed to raise the ebuild's version
>>> number from 1.20.3 when making this change, and also didn't notify users
>>> by a NEWS item, that I can see.
>>
>> Emerge will catch this, no need for revbump. Unless you're not using -D
>> (--deep) when updating world. Which you should.
> 
> What do you mean "catch this"?
> 
> I always use -D, and the change broke my system.

I mean that a USE flag change will trigger a rebuild of the package, and 
the USE flag in question is shown by portage. So you'll know something 
has changed. If you went ahead and allowed it to rebuild, it would of 
course break xorg, but you'd know why since you've seen the USE flag 
change and know that the breakage most probably had something to do with 
that USE flag.