libgtk-2_0-0 from home:MaxxedSUSE:Compiler-Tools project
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Add repository and install manually
For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:MaxxedSUSE:Compiler-Tools/openSUSE_Tumbleweed/home:MaxxedSUSE:Compiler-Tools.repo zypper refresh zypper install libgtk-2_0-0