typelib-1_0-Gdl-3 from home:fsirl:inkscape project
Select Your Operating System
Add repository and install manually
For 15.4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:fsirl:inkscape/15.4/home:fsirl:inkscape.repo zypper refresh zypper install typelib-1_0-Gdl-3