libgtk-2_0-0 from GNOME:STABLE:3.12 project

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For openSUSE 13.1 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/GNOME:STABLE:3.12/openSUSE_13.1/GNOME:STABLE:3.12.repo
zypper refresh
zypper install libgtk-2_0-0