gcc11 from systemsmanagement:Uyuni:Master:SLE12-Uyuni-Client-Tools:Build-Dependencies project
Select Your Operating System
Add repository and install manually
For SLE 12 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/systemsmanagement:Uyuni:Master:SLE12-Uyuni-Client-Tools:Build-Dependencies/SLE_12/systemsmanagement:Uyuni:Master:SLE12-Uyuni-Client-Tools:Build-Dependencies.repo zypper refresh zypper install gcc11