For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:sir_tobe/openSUSE_Tumbleweed/home:sir_tobe.repo
zypper refresh
zypper install EMBOSS
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:sir_tobe/15.6/home:sir_tobe.repo
zypper refresh
zypper install EMBOSS
For 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:sir_tobe/15.5/home:sir_tobe.repo
zypper refresh
zypper install EMBOSS