For openSUSE Leap 15.2 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:gps4net/openSUSE_Leap_15.2/home:gps4net.repo
zypper refresh
zypper install checkinstall
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:gps4net/15.6/home:gps4net.repo
zypper refresh
zypper install checkinstall
For 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:gps4net/15.5/home:gps4net.repo
zypper refresh
zypper install checkinstall
For 15.4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:gps4net/15.4/home:gps4net.repo
zypper refresh
zypper install checkinstall
For 15.3 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:gps4net/15.3/home:gps4net.repo
zypper refresh
zypper install checkinstall