Quoting Thomas Kahle <[email protected]>:

On 17:27 Wed 30 May 2012, P Purkayastha wrote:
On 05/30/2012 05:07 PM, Thomas Kahle wrote:
> Hi,
> I'm trying to build sage on gentoo but I get a conflict:
>
> !!! Multiple package instances within a single package slot have been pulled
> !!! into the dependency graph, resulting in a slot conflict:
>
> dev-python/numpy:0
>
> (dev-python/numpy-1.5.1::sage-on-gentoo, ebuild scheduled for merge) pulled in by > ~dev-python/numpy-1.5.1 required by (sci-mathematics/sage-5.0-r1::sage-on-gentoo, ebuild scheduled for merge)
>
> (dev-python/numpy-1.6.0::gentoo, ebuild scheduled for merge) pulled in by > >=dev-python/numpy-1.5[lapack] required by (sci-libs/scipy-0.9.0-r1::gentoo, ebuild scheduled for merge)
>
> Any suggestions?
>
> Thanks!
> Thomas
>

The latter package scipy depends on >=numpy-1.5 whereas sage depends on =numpy-1.5.1. So, simply mask the higher versions of numpy:

If you have /etc/portage/package.mask directory then,

echo ">dev-python/numpy-1.5.1" >> /etc/portage/package.mask/mask_numpy

otherwise

echo ">dev-python/numpy-1.5.1" >> /etc/portage/package.mask

... and now it pulls in eselect-cblas and gsl which are blocking each other:

[blocks B ] app-admin/eselect-cblas ("app-admin/eselect-cblas" is blocking sci-libs/gsl-1.15-r2)

 * Error: The above package list contains packages which cannot be
 * installed at the same time on the same system.

(app-admin/eselect-cblas-0.1::gentoo, ebuild scheduled for merge) pulled in by app-admin/eselect-cblas required by (sci-libs/cblas-reference-20030223-r4::gentoo, ebuild scheduled for merge)

  (sci-libs/gsl-1.15-r2::science, installed) pulled in by
    sci-libs/gsl required by (media-gfx/inkscape-0.48.2::gentoo, installed)
>=sci-libs/gsl-1.15 required by (sci-mathematics/sage-5.0-r1::sage-on-gentoo, ebuild scheduled for merge)

I think that's a different problem. You are using blas stuff from the science
overlay but the version of cblas-reference from the main tree as a higher
version number than the one from the science overlay (3. something?). So you
probably have to mask sci-libs/cblas-reference::gentoo.

For your original problem, yes portage should solve the conflict, this is very
strange, are numpy or scipy part of your world file?

Francois



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