typelib-1_0-Gst-1_0 from openSUSE:Leap:42.3 project
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For standard run the following as root:
zypper addrepo https://download.opensuse.org/repositories/openSUSE:Leap:42.3/standard/openSUSE:Leap:42.3.repo zypper refresh zypper install typelib-1_0-Gst-1_0