[gentoo-user] Re: "Multiple package instances ....". Help me understand this emerge error, please.

[Jonathan Callen <jcallen@gentoo.org>]

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Alan,

The easiest method may be to parse the error given:

On 02/23/2014 07:13 AM, Alan Mackenzie wrote:
>>> ############################################################################### !!!
>>> Multiple package instances within a single package slot have been pulled !!! into the
>>> dependency graph, resulting in a slot conflict:
>>> 
>>> media-libs/libpng:0
>>> 
>>> (media-libs/libpng-1.5.17-r1::gentoo, installed) pulled in by media-libs/libpng:0/0=
>>> required by (x11-libs/cairo-1.12.14-r4::gentoo, installed)
>>>> =media-libs/libpng-1.4:0/0= required by (app-editors/emacs-24.3-r2::gentoo, installed)
>>> media-libs/libpng:0/0= required by (media-libs/libwebp-0.3.1::gentoo, installed) 
>>> media-libs/libpng:0/0= required by (net-print/cups-filters-1.0.36-r1::gentoo, installed) 
>>> media-libs/libpng:0/0= required by (kde-base/kdelibs-4.11.2-r1::gentoo, installed) 
>>> media-libs/libpng:0/0= required by (dev-qt/qtgui-4.8.5-r1::gentoo, installed) 
>>> media-libs/libpng:0/0= required by (app-text/poppler-0.24.3::gentoo, installed) (and 3 more
>>> with the same problems)
>>> 
>>> (media-libs/libpng-1.6.8::gentoo, ebuild scheduled for merge) pulled in by (no parents that
>>> aren't satisfied by other packages in this slot) 
>>> ###############################################################################

Each of the packages listed will need to be rebuilt with libpng, so try listing them explicitly on
the same emerge command (note that `emerge -uD @world` lists them implicitly, so doing that
sometimes will work when a single package fails).

For example, you may be able to get

# emerge --oneshot media-libs/libpng:0/16 x11-libs/cairo app-editors/emacs \
	media-libs/libwebp net-print/cups-filters kde-base/kdelibs dev-qt/qtgui \
	app-text/poppler

to work, or to give you the "3 more with the same problems", which can then be added to the
command line and rebuilt.

Because you didn't tell portage that it was allowed to rebuild packages not listed on the command
line, portage refused to update the package you *did* list, because it would break those other
packages.

- -- 
Jonathan Callen
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