For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/Emulators/openSUSE_Tumbleweed/Emulators.repo
zypper refresh
zypper install snes9x
For openSUSE Slowroll run the following as root:
zypper addrepo https://download.opensuse.org/repositories/Emulators/openSUSE_Slowroll/Emulators.repo
zypper refresh
zypper install snes9x
For openSUSE Factory ARM run the following as root:
zypper addrepo https://download.opensuse.org/repositories/Emulators/openSUSE_Factory_ARM/Emulators.repo
zypper refresh
zypper install snes9x
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/Emulators/15.6/Emulators.repo
zypper refresh
zypper install snes9x
For 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/Emulators/15.5/Emulators.repo
zypper refresh
zypper install snes9x