For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:brassh:proxmox/openSUSE_Tumbleweed/home:brassh:proxmox.repo
zypper refresh
zypper install sassc
For openSUSE Slowroll run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:brassh:proxmox/openSUSE_Slowroll/home:brassh:proxmox.repo
zypper refresh
zypper install sassc
For 16.0 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:brassh:proxmox/16.0/home:brassh:proxmox.repo
zypper refresh
zypper install sassc
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:brassh:proxmox/15.6/home:brassh:proxmox.repo
zypper refresh
zypper install sassc