python-tinycss2 from Application:ERP:Tryton:6.0 project
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Add repository and install manually
For 15.4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/Application:ERP:Tryton:6.0/15.4/Application:ERP:Tryton:6.0.repo zypper refresh zypper install python-tinycss2