gtk3-tools from home:DrinkyBird:gtk3-classic project
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For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:DrinkyBird:gtk3-classic/openSUSE_Tumbleweed/home:DrinkyBird:gtk3-classic.repo zypper refresh zypper install gtk3-tools