libgtk-2_0-0 from home:drankinatty project
Select Your Operating System
Add repository and install manually
For 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:drankinatty/15.5/home:drankinatty.repo zypper refresh zypper install libgtk-2_0-0