For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:ykoba/openSUSE_Tumbleweed/home:ykoba.repo
zypper refresh
zypper install sl
For openSUSE Leap 42.3 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:ykoba/openSUSE_Leap_42.3/home:ykoba.repo
zypper refresh
zypper install sl
For openSUSE Leap 15.1 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:ykoba/openSUSE_Leap_15.1/home:ykoba.repo
zypper refresh
zypper install sl
For openSUSE 13.2 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:ykoba/openSUSE_13.2/home:ykoba.repo
zypper refresh
zypper install sl
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:ykoba/15.6/home:ykoba.repo
zypper refresh
zypper install sl
For 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:ykoba/15.5/home:ykoba.repo
zypper refresh
zypper install sl
For 15.4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:ykoba/15.4/home:ykoba.repo
zypper refresh
zypper install sl