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

Calculating dependencies... done!


[nomerge       ] gnome-base/gnome-3.14.1:2.0  USE="accessibility bluetooth cdr classic cups extras" 
[nomerge       ]  gnome-base/gnome-core-apps-3.14.1:3.0  USE="bluetooth cdr cups" 
[ebuild     U  ]   x11-terms/gnome-terminal-3.14.1-r1 [3.14.1] USE="deprecated gnome-shell nautilus -debug" 0 kB
[nomerge       ] gnome-base/gnome-3.14.1:2.0  USE="accessibility bluetooth cdr classic cups extras" 
[nomerge       ]  gnome-base/gnome-extra-apps-3.14.1-r1:3.0  USE="epiphany evolution games shotwell tracker" 
[ebuild     U  ]   net-misc/vinagre-3.14.1-r1 [3.14.1] USE="ssh telepathy -avahi -rdp -spice" 0 kB
[nomerge       ] gnome-base/gnome-shell-3.14.1.5  USE="bluetooth deprecated i18n networkmanager -systemd" PYTHON_TARGETS="python2_7" 
[nomerge       ]  gnome-base/gnome-control-center-3.14.1-r1:2  USE="bluetooth colord cups deprecated gnome-online-accounts i18n -debug -kerberos -v4l" INPUT_DEVICES="-wacom" 
[ebuild     U  ]   gnome-extra/gnome-color-manager-3.14.1-r1 [3.14.1] USE="(-packagekit) -raw {-test}" 0 kB
[nomerge       ] net-misc/vinagre-3.14.1-r1 [3.14.1] USE="ssh telepathy -avahi -rdp -spice" 
[ebuild     U  ]  dev-libs/appstream-glib-0.3.2:0/7 [0.3.0:0/7] USE="introspection nls" 2,183 kB
[ebuild     U  ]   dev-util/appdata-tools-0.1.8-r1 [0.1.8] USE="(-nls%*)" 0 kB

Total: 5 packages (5 upgrades), Size of downloads: 2,183 kB

 * Error: circular dependencies:

(dev-util/appdata-tools-0.1.8-r1::gentoo, ebuild scheduled for merge) depends on
 (dev-libs/appstream-glib-0.3.2::gentoo, ebuild scheduled for merge) (buildtime)
  (dev-util/appdata-tools-0.1.8-r1::gentoo, ebuild scheduled for merge) (runtime)

 * Note that circular dependencies can often be avoided by temporarily
 * disabling USE flags that trigger optional dependencies.