On Wednesday, 11 May 2022 10:57:03 BST Francisco Ares wrote:
> Hello
> 
> After a main HD failure, I'll have to reinstall Gentoo from almost zero - I
> have a full and recent copy of the /etc directory and the file
> /var/lib/portage/world in a secondary HD (along many personal backups).
> 
> Installation basics done, now it is time for an emerge world.
> 
> Although the emerge lists is as huge as expected, it doesn't even start,
> portage says there are cyclic USE flags that I should avoid at the first
> moment, but may restore afterwards.
> 
> But it doesn't say which are those USE flags that block each other.
> 
> Is there any way to find those better than brute force?
> 
> By the way, I also have a copy of all binary packages (I always use the -b
> flag while emerging any package) in that second disk. But that didn't help
> so far, even trying to use the -K flag. I thought on un-tar'ing those
> binary packages by hand, but portage will be unaware of this, not knowing
> the packages are installed.
> 
> Any hint will be greatly appreciated!
> 
> Thanks
> 
> Francisco

Try emerging @system first and see if this succeeds.  I recall something 
similar on a recent fresh (re)installation, but the USE flags causing the 
circular block were reported in the emerge output, so I was able to unset and 
reset them at the time.

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