typelib-1_0-Gdl-3 from openSUSE:Leap:15.0 project
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For standard run the following as root:
zypper addrepo https://download.opensuse.org/repositories/openSUSE:Leap:15.0/standard/openSUSE:Leap:15.0.repo zypper refresh zypper install typelib-1_0-Gdl-3