perl-GD from OBS:Server:2.9:Staging project
Select Your Operating System
Add repository and install manually
For SLE 12 SP4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/OBS:Server:2.9:Staging/SLE_12_SP4/OBS:Server:2.9:Staging.repo zypper refresh zypper install perl-GD