Arch Linux

I use the repository gnome-unstable and:

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[helq@myArchTwo ~]$ sudo pacman-color -S gnome-unstable/{gnome,gdm,gnome-extra}
resolving dependencies...
looking for inter-conflicts...

Targets (57): at-spi2-atk-1.91.91-1 [0.05 MB] at-spi2-core-1.91.91-1 [0.15 MB]
epiphany-2.91.91-1 [3.46 MB] gnome-session-2.91.91.3-1 [0.35 MB]
gdm-2.91.93-1 [0.91 MB] gnome-desktop-2.91.91-1 [0.47 MB]
gnome-panel-2.91.91-1 [1.52 MB] gucharmap-2.33.2-1 [1.95 MB]
gnome-applets-2.91.4-2 [6.43 MB]
gnome-settings-daemon-2.91.91-2 [0.50 MB]
gnome-control-center-2.91.91-1 [2.20 MB]
gnome-icon-theme-2.91.7-1 [8.01 MB]
gnome-icon-theme-extras-2.90.7-1 [0.71 MB]
gnome-icon-theme-symbolic-2.91.7-1 [0.08 MB]
gnome-keyring-2.91.92-1 [0.84 MB] gnome-media-2.91.2-2 [1.05 MB]
gnome-screensaver-2.91.91-1 [0.26 MB] zenity-2.91.90-1 [2.52 MB]
mutter-2.91.91-1 [0.89 MB] gnome-shell-2.91.91-2 [0.49 MB]
gnome-terminal-2.33.90-1 [1.17 MB]
gnome-themes-standard-2.91.91-1 [0.68 MB]
yelp-2.91.91-1 [0.57 MB] gnome-user-docs-2.91.91-1 [0.07 MB]
nautilus-2.91.91-1 [2.24 MB]
notification-daemon-0.7.1-1 [0.03 MB]
cheese-2.91.91.1-1 [4.31 MB] ekiga-3.3.0-2 [7.03 MB]
empathy-2.91.91-1 [2.15 MB] eog-2.91.91-1 [1.83 MB]
evince-2.91.90-1 [1.42 MB] evolution-2.91.91-1 [22.05 MB]
evolution-exchange-2.91.91-1 [0.64 MB]
file-roller-2.91.91-1 [0.98 MB] gcalctool-5.91.90-1 [0.45 MB]
gconf-editor-2.91.91.1-1 [0.95 MB] gedit-2.91.8-1 [1.44 MB]
gnome-games-2.91.90-1 [18.28 MB]
gnome-power-manager-2.91.90-1 [2.97 MB]
gnome-system-monitor-2.99.1-1 [1.75 MB]
gnome-utils-2.91.90-1 [5.71 MB] mousetweaks-2.91.91-1 [1.71 MB]
nautilus-sendto-2.91.6-1 [0.11 MB] libwnck-2.30.6-2 [0.31 MB]
python-wnck-2.32.0-4 [0.01 MB] dbus-python-0.83.1-2 [0.10 MB]
at-spi-1.32.0-2 [0.37 MB] gnome-speech-0.4.25-1 [0.07 MB]
gnome-mag-0.16.1-1 [0.13 MB] tcl-8.5.9-1 [1.63 MB]
brltty-4.2-3 [0.67 MB] pyxdg-0.19-2 [0.05 MB]
orca-2.91.91-1 [1.99 MB] seahorse-2.91.91-1 [1.43 MB]
totem-2.91.91-1 [2.14 MB] vinagre-2.91.91-1 [1.78 MB]
vino-2.99.3-1 [0.32 MB]

Total Download Size: 0.00 MB
Total Installed Size: 496.54 MB

Proceed with installation? [Y/n] y
checking package integrity...
(57/57) checking for file conflicts [######################] 100%
error: failed to commit transaction (conflicting files)
/usr/lib/gtk-2.0/modules/libatk-bridge.so exists in both 'at-spi2-atk' and 'at-spi'
Errors occurred, no packages were upgraded.