For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:etamPL/openSUSE_Tumbleweed/home:etamPL.repo
zypper refresh
zypper install lagrange
For openSUSE Factory PowerPC run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:etamPL/openSUSE_Factory_PowerPC/home:etamPL.repo
zypper refresh
zypper install lagrange
For openSUSE Factory ARM run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:etamPL/openSUSE_Factory_ARM/home:etamPL.repo
zypper refresh
zypper install lagrange
For 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:etamPL/15.5/home:etamPL.repo
zypper refresh
zypper install lagrange
For 15.4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:etamPL/15.4/home:etamPL.repo
zypper refresh
zypper install lagrange