rubygem-websocket-extensions from openSUSE:infrastructure:redmine project
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Adicionar repositório e instalar manualmente
Para 15.6 execute o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/openSUSE:infrastructure:redmine/15.6/openSUSE:infrastructure:redmine.repo zypper refresh zypper install rubygem-websocket-extensions