For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:bmwiedemann:branches:Base:System/openSUSE_Tumbleweed/home:bmwiedemann:branches:Base:System.repo
zypper refresh
zypper install gawk
For openSUSE Factory ARM run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:bmwiedemann:branches:Base:System/openSUSE_Factory_ARM/home:bmwiedemann:branches:Base:System.repo
zypper refresh
zypper install gawk
For 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:bmwiedemann:branches:Base:System/15.5/home:bmwiedemann:branches:Base:System.repo
zypper refresh
zypper install gawk