Для openSUSE Tumbleweed запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/home:mnhauke:games/openSUSE_Tumbleweed/home:mnhauke:games.repo
zypper refresh
zypper install doomretro
Для 16.0 запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/home:mnhauke:games/16.0/home:mnhauke:games.repo
zypper refresh
zypper install doomretro
Для 15.6 запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/home:mnhauke:games/15.6/home:mnhauke:games.repo
zypper refresh
zypper install doomretro