systemd-portable from home:vlefebvre:systemd-users project

For openSUSE Tumbleweed run the following as root:

zypper addrepo https://download.opensuse.org/repositories/home:vlefebvre:systemd-users/openSUSE_Tumbleweed/home:vlefebvre:systemd-users.repo
zypper refresh
zypper install systemd-portable