python3-alabaster from home:wicked:qubes-build project
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Add repository and install manually
For openSUSE Leap 15.3 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:wicked:qubes-build/openSUSE_Leap_15.3/home:wicked:qubes-build.repo zypper refresh zypper install python3-alabaster