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linux - emerge complains about blocked packages: what do I do?

We have an old development server running Gentoo at work. I would like to update this system, but I keep running into problems with the packaging system. To me, it seems like there are dependencies on several versions of various packages, and I cannot see how to fix it.


The biggest problem is probably relating to Python and Portage. I need a newer portage, but there seems like there are cyclical dependencies going on.


I have tried various solutions, but not quite sure to go from here. Any clues that might get me further in fixing it?


Further information


The following is the (relevant bit of the) output from running emerge --update --newuse --deep @world


(lots of normal output ....)
[ebuild     U ] app-misc/mc-4.7.0.3 [4.6.1-r4] USE="edit%* -slang*" 
....
[blocks B     ] >=dev-lang/python-2.6.6 (">=dev-lang/python-2.6.6" is blocking sys-apps/portage-2.1.6.7)
[blocks B     ] [blocks B     ] 
 * Error: The above package list contains packages which cannot be
 * installed at the same time on the same system.

  (dev-lang/python-2.7.1-r1, ebuild scheduled for merge) pulled in by
    =dev-lang/python-2* required by (dev-vcs/mercurial-1.7, ebuild scheduled for merge)
    =dev-lang/python-2*[threads] required by (dev-vcs/mercurial-1.7, ebuild scheduled for merge)
    =dev-lang/python-2* required by (dev-libs/glib-2.28.6, ebuild scheduled for merge)
    (and 1 more)

  (app-shells/bash-4.1_p9, ebuild scheduled for merge) pulled in by
    >=app-shells/bash-3.2_p17 required by (sys-apps/portage-2.1.9.42, ebuild scheduled for merge)
    app-shells/bash required by (sys-block/di-4.18, ebuild scheduled for merge)
    app-shells/bash required by (app-admin/perl-cleaner-2.7, ebuild scheduled for merge)
    (and 2 more)

  (dev-lang/python-3.1.3-r1, ebuild scheduled for merge) pulled in by
    dev-lang/python required by (app-admin/python-updater-0.9, ebuild scheduled for merge)
    >=dev-lang/python-3 required by (sys-apps/portage-2.1.9.42, ebuild scheduled for merge)
    =dev-lang/python-3.1* required by (dev-java/java-config-2.1.11-r3, ebuild scheduled for merge)

This is the relevant bit of the output when running emerge --pretend --depclean


Calculating dependencies... done!
 * Dependencies could not be completely resolved due to
 * the following required packages not being installed:
 * 
 *   >=dev-lang/python-2.4 pulled in by:
 *     sys-apps/portage-2.1.6.7
 * 
 *   dev-lang/python pulled in by:
 *     dev-java/java-config-2.1.7
 * 
 *   dev-lang/python pulled in by:
 *     dev-libs/libxml2-2.6.31
 * 
 *    *     sys-apps/portage-2.1.6.7
 * 
 *   >=dev-lang/python-2.2 pulled in by:
 *     dev-libs/beecrypt-4.1.2-r1
 * 
 *   virtual/python pulled in by:
 *     dev-python/pycrypto-2.0.1-r6
 * 
 *   >=dev-lang/python-2.3 pulled in by:
 *     dev-vcs/mercurial-1.0.2
 * 
 *   >=dev-java/java-config-2.1.9-r1 pulled in by:
 *     dev-libs/beecrypt-4.1.2-r1
 * 
 *   virtual/python pulled in by:
 *     dev-lang/swig-1.3.34
 * 
 *   dev-lang/python pulled in by:
 *     net-fs/samba-3.0.28a-r1
 * 
 *   >=dev-lang/python-2.2 pulled in by:
 *     app-arch/rpm-4.4.6-r6
 * 
 *   >=virtual/python-2.2.1 pulled in by:
 *     sys-libs/libcap-1.10-r11
 * 
 *   dev-lang/python pulled in by:
 *     sys-libs/cracklib-2.8.9-r1
 *

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