On 23/02/2014 14:13, Alan Mackenzie wrote:
>> - are you sure that's an emerge failure and not just a convoluted info
>> > message? Perhaps post the entire emerge output.
> I tried it again without the -p, and got the same output.
> 
> I think this is a portage bug.  At the very least, it's poor
> documentation.  I've reported the situation to bugs.gentoo.org, bug
> #502236.
> 
> Thanks for the help.
> 

I don't think you have a portage bug as such (other than the sloppy
bizarre output messages that are going into recent versions). I think we
have bug in an ebuild, probably a maintainer that doesn't quite know how
to navigate these new subslots waters,


One of the other replies suggested to unmerge libpng, emerge it back,
and continue with emerge world, @preserved-rebuild, revdep-rebuild.

Chances are this will work around the issue and let you update
everything. There *is* a chance some package(s) won't work with or won't
compile with libpng[1] and you'll have to unwind things again. If this
happens that will be valuable info to add the entry at bgo

[1] This happened to me at least once before, I had to package.mask the
latest version of the library until the tree sorted itself out. IIRC, it
was libpng then too!


-- 
Alan McKinnon
alan.mckin...@gmail.com


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