For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:Jianhua:devel-tools/openSUSE_Tumbleweed/home:Jianhua:devel-tools.repo
zypper refresh
zypper install gn
For openSUSE Slowroll run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:Jianhua:devel-tools/openSUSE_Slowroll/home:Jianhua:devel-tools.repo
zypper refresh
zypper install gn
For openSUSE Factory ARM run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:Jianhua:devel-tools/openSUSE_Factory_ARM/home:Jianhua:devel-tools.repo
zypper refresh
zypper install gn
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:Jianhua:devel-tools/15.6/home:Jianhua:devel-tools.repo
zypper refresh
zypper install gn
For 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:Jianhua:devel-tools/15.5/home:Jianhua:devel-tools.repo
zypper refresh
zypper install gn