Для openSUSE Tumbleweed запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/network/openSUSE_Tumbleweed/network.repo
zypper refresh
zypper install gajim
Для openSUSE Factory PowerPC запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/network/openSUSE_Factory_PowerPC/network.repo
zypper refresh
zypper install gajim
Для openSUSE Factory ARM запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/network/openSUSE_Factory_ARM/network.repo
zypper refresh
zypper install gajim
Для 15.6 запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/network/15.6/network.repo
zypper refresh
zypper install gajim