Для openSUSE Tumbleweed запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/home:munix9/openSUSE_Tumbleweed/home:munix9.repo
zypper refresh
zypper install gambas3
Для 16.0 запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/home:munix9/16.0/home:munix9.repo
zypper refresh
zypper install gambas3
Для 15.6 запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/home:munix9/15.6/home:munix9.repo
zypper refresh
zypper install gambas3