Re: [gentoo-user] Blockers problem: no ebuilds to satisfy "media-libs/libpng:0/0="

[Alan McKinnon]

On 13/04/2014 17:05, Matthias Bethke wrote:
> For the first time in years portage is driving me crazy. I'm trying to
> update my desktop after half a year in storage and coping with the Gnome
> 3.10 upgrade that I want to avoid because of systemd. And this is where
> it always gets stuck:
>
> | aldous ~ # emerge --keep-going --jobs=5 -DNuvta @world
> |
> | These are the packages that would be merged, in reverse order:
> |
> | Calculating dependencies... done!
> |
> | emerge: there are no ebuilds to satisfy "media-libs/libpng:0/0=".
> | (dependency required by "media-gfx/rawstudio-2.0-r1" [installed])
> | (dependency required by "@selected" [set])
> | (dependency required by "@world" [argument])
>
> | aldous ~ # eix libpng
> | [I] media-libs/libpng
> |      Available versions:
> |      (1.2)  1.2.50-r1 ~1.2.51
> |      (1.5)  1.5.17-r15 ~1.5.18
> |      (0)    1.6.8(0/16) ~1.6.9(0/16) ~1.6.10(0/16)
> |        {apng neon static-libs ABI_MIPS="n32 n64 o32" ABI_X86="32 64 x32"}
> |      Installed versions:  1.6.8(09:32:10 PM 03/29/2014)(apng -neon -static-libs ABI_MIPS="-n32 -n64 -o32" ABI_X86="64 -32 -x32")
> |      Homepage:            http://www.libpng.org/
> |      Description:         Portable Network Graphics library
>
> So media-libs/libpng:0 is indeed installed, and it not only works but
> | emerge -1vta `equery d libpng`
> does work, too. That way I have already recompiled every single thing
> that requires libpng, including rawstudio so IMAO it shouldn't even come
> up during @world updating, and if there is some reason for to be
> recompiled it should work just like when I say "emerge -1 rawstudio".
>
> I've run into a few blockers during this update run and Google has been
> my friend for most of there, but here I only find some QT-related forum
> entries that seem to be unrelated or offer solutions like masking some
> libpng version
> [http://forums.gentoo.org/viewtopic-p-7520134.html#7520134] that didn't
> help and frankly sound rather voodoo.
>
> Could anyone help me out here?


This sort of query is coming up a lot lately, a common suggestion to
help portage out is to use the --backtrack option with a high number
like 30 or 100.

Give that a try.

A second, blunt weapon, approach is to quickpkg libpng, unmerge libpng
then emerge rawstudio back (or even -avuND world) and let portage get on
with the business of figuring stuff out that will work



-- 
Alan McKinnon
alan.mckinnon@×××××.com