apache2-mod_auth_gssapi from home:teamlinux:branches:Apache:Modules project
Select Your Operating System
Add repository and install manually
For SLE 12 SP5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:teamlinux:branches:Apache:Modules/SLE_12_SP5/home:teamlinux:branches:Apache:Modules.repo zypper refresh zypper install apache2-mod_auth_gssapi