For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:mrey/openSUSE_Tumbleweed/home:mrey.repo
zypper refresh
zypper install wl-clipboard
For 15.4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:mrey/15.4/home:mrey.repo
zypper refresh
zypper install wl-clipboard
For 15.3 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:mrey/15.3/home:mrey.repo
zypper refresh
zypper install wl-clipboard