On 15-03-15 at 00:12, Alan McKinnon wrote:
> It took 10 years but I've finally done something monumentally stupid in
> Gentoo:
> 
> I delete package.use and have no backup
> 
> Is there any easy way to recover what was in it? I'm busy doing it the
> long way round - repeatedly running emerge world, get past the blocking
> USE, then see all the flags that portage thinks changed.
> 
> I wonder if there might be an easier way that I don't know of.
Have you tried:
emerge -pDU --with-bdeps=y @world

That should list all packages where the installed use-flags differ from
the "current" use-flags.

-- 
Simon Thelen

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