[gentoo-science] sage-6.7 and downgrade of python packages

[Juergen Rose <rose@rz.uni-potsdam.de>]

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Hello,

I removed sage-6.7 from my gentoo system, because it requires old
python packages. These old python generates further bugs. I posted a
gentoo bug https://bugs.gentoo.org/show_bug.cgi?id=547064 , but I did
not get any answer.

If I now try to reinstall sage, three python packages should be
downgraded generating a slot conflict:

root@lynx:/root(43)# emerge -pvD sage

These are the packages that would be merged, in order:

Calculating dependencies... done!
[ebuild     UD ] dev-python/numpy-1.8.2::gentoo [1.9.2::gentoo]
USE="doc lapack {-test}" PYTHON_TARGETS="python2_7 python3_3 
-python3_4" 0 KiB
[ebuild     UD ] dev-python/sphinx-1.2.2::sage-on-gentoo
[1.3.1::gentoo] USE="doc latex {-test}" PYTHON_TARGETS="python2_7
python3_3 -pypy -python3_4" 0 KiB
[ebuild     UD ] dev-python/matplotlib-1.3.1::sage-on-gentoo
[1.4.3::gentoo] USE="cairo examples excel fltk gtk gtk3 latex tk
wxwidgets -doc -pyside -qt4* {-test} (-qt5%*)"
PYTHON_TARGETS="python2_7 python3_3 -python3_4" 0 KiB
[ebuild     UD ] sci-mathematics/maxima-5.35.1-r2::sage-on-gentoo
[5.36.1::gentoo] USE="X ecls emacs latex nls sbcl tk unicode -clisp 
-clozurecl (-cmucl) -gcl -xemacs" LINGUAS="-es -pt -pt_BR" 0 KiB
[ebuild  N     ] sci-mathematics/sage-6.7::sage-on-gentoo  USE="latex
testsuite -arb -bliss -debug -modular_decomposition"
PYTHON_TARGETS="python2_7" 0 KiB

Total: 5 packages (4 downgrades, 1 new), Size of downloads: 0 KiB

!!! 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-1.8.2:0/0::gentoo, ebuild scheduled for merge)
pulled in by
    =dev-python/numpy-1.8*[python_targets_python2_7(-)?,
-python_single_target_python2_7(-)] required by (sci-mathematics/sage
-6.7:0/0::sage-on-gentoo, ebuild scheduled for merge)
    ^                 ^^^^                                             
                                                                       
                                                                       
                    

  (dev-python/numpy-1.9.2:0/0::gentoo, installed) pulled in by
    >=dev-python/numpy-1.9.1[python_targets_python2_7(
-)?,python_targets_python3_3(-)?,python_targets_python3_4(-)?,
-python_single_target_python2_7(-),-python_single_target_python3_3(-),
-python_single_target_python3_4(-)] required by (dev-python/bottleneck
-1.0.0:0/0::gentoo, installed)
    ^^                 ^^^^^ 
                                                                       
                                                                       
                                          Is there any hint, how to
handle this situation? 

Regards
Juergen
       

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