Para openSUSE Tumbleweed corra o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/home:ilikebreadtoomuch/openSUSE_Tumbleweed/home:ilikebreadtoomuch.repo
zypper refresh
zypper install grafx2
Para 15.5 corra o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/home:ilikebreadtoomuch/15.5/home:ilikebreadtoomuch.repo
zypper refresh
zypper install grafx2
Para 15.4 corra o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/home:ilikebreadtoomuch/15.4/home:ilikebreadtoomuch.repo
zypper refresh
zypper install grafx2