emerge

emerge -av =gnome-2.32.1-r2

 * IMPORTANT: 21 news items need reading for repository 'gentoo'.
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These are the packages that would be merged, in order:

Calculating dependencies... done!

!!! Multiple package instances within a single package slot have been pulled
!!! into the dependency graph, resulting in a slot conflict:

gnome-extra/evolution-data-server:0

  (gnome-extra/evolution-data-server-2.32.3-r3:0/0::gnome2, ebuild scheduled for merge) pulled in by
    <gnome-extra/evolution-data-server-3.6 required by (gnome-extra/evolution-webcal-2.32.0:0/0::gnome2, ebuild scheduled for merge)
    ^                                  ^^^

  (gnome-extra/evolution-data-server-3.20.5:0/57::gentoo, ebuild scheduled for merge) pulled in by
    >=gnome-extra/evolution-data-server-3.17.2:= required by (gnome-base/gnome-shell-3.20.4:0/0::gentoo, ebuild scheduled for merge)
    ^^                                  ^^^^^^

dev-libs/libgweather:2

  (dev-libs/libgweather-2.30.3-r1:2/2::gnome2, ebuild scheduled for merge) pulled in by
    <dev-libs/libgweather-2.90.1:2 required by (gnome-base/gnome-panel-2.32.1-r4:0/0::gnome2, ebuild scheduled for merge)
    ^                     ^^^^^^^^
    (and 3 more with the same problem)

  (dev-libs/libgweather-3.20.3:2/3-6::gentoo, ebuild scheduled for merge) pulled in by
    >=dev-libs/libgweather-3.10:2= required by (gnome-extra/evolution-data-server-3.20.5:0/57::gentoo, ebuild scheduled for merge)
    ^^                     ^^^^^^^

NOTE: Use the '--verbose-conflicts' option to display parents omitted above

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. You may want to try a larger value of
the --backtrack option, such as --backtrack=30, in order to see if
that will solve this conflict automatically.

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


The following mask changes are necessary to proceed:
 (see "package.unmask" in the portage(5) man page for more details)
# required by gnome-base/gnome-shell-3.20.4::gentoo
# required by gnome-base/gdm-3.20.1::gentoo
# required by gnome-base/gnome-2.32.1-r2::gnome2
# required by =gnome-2.32.1-r2 (argument)
# /etc/portage/package.mask/gnome3:
=gnome-extra/evolution-data-server-3.20.5
# required by gnome-extra/evolution-data-server-3.20.5::gentoo[weather]
# required by gnome-base/gnome-shell-3.20.4::gentoo
# required by gnome-base/gdm-3.20.1::gentoo
# required by gnome-base/gnome-2.32.1-r2::gnome2
# required by =gnome-2.32.1-r2 (argument)
# /etc/portage/package.mask/gnome3:
=dev-libs/libgweather-3.20.3

NOTE: The --autounmask-keep-masks option will prevent emerge
      from creating package.unmask or ** keyword changes.

Would you like to add these changes to your config files? [Yes/No]