I ran into similar errors recently.

I had a system with several packages that were installed using overlays 
(/usr/local/portage)

The same package versions became available in the "proper" portage tree, 
presumably with slightly different settings, and caused problems.

I had to remove the overlays, unmerge the existing packages, and emerge the new 
ones from the portage tree.

--Todd

Randy Barlow wrote:
Hi all! I recently setup squirrelmail on my system, and it downgraded gnupg to 1.4.7-r1 from 2.*. Now when I try to do an emerge --update --deep world I get this:

Calculating world dependencies \
!!! Multiple versions within a single package slot have been !!! pulled into the dependency graph:

app-crypt/gnupg:0

  ('installed', '/', 'app-crypt/gnupg-1.4.7-r1', 'nomerge') pulled in by
    ('installed', '/', 'mail-client/squirrelmail-1.4.10a-r2', 'nomerge')

  ('ebuild', '/', 'app-crypt/gnupg-2.0.7-r1', 'merge') pulled in by
    ('installed', '/', 'x11-plugins/enigmail-0.95.6-r2', 'nomerge')
    ('installed', '/', 'mail-filter/spamassassin-3.2.1-r1', 'nomerge')
    ('installed', '/', 'mail-client/evolution-2.12.3-r1', 'nomerge')


It may be possible to solve this problem by using package.mask to
prevent one of those packages from being selected. However, it is also
possible that conflicting dependencies exist such that they are
impossible to satisfy simultaneously. If such a conflict exists in the
dependencies of two different packages, then those packages can not be
installed simultaneously.

For more information, see MASKED PACKAGES section in the emerge man page
or refer to the Gentoo Handbook.

!!! Depgraph creation failed.

I see that squirrelmail has a 'crypt' USE variable that I could disable, would that solve this problem? Would that have any other consequences that I should consider? I don't generally sign or encrypt e-mails, so that wouldn't be a concern for me. Thanks!

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