Para 16.0 execute o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/home:bwalger/16.0/home:bwalger.repo
zypper refresh
zypper install apache2-prefork
Para 15.6 execute o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/home:bwalger/15.6/home:bwalger.repo
zypper refresh
zypper install apache2-prefork
Para 15.5 execute o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/home:bwalger/15.5/home:bwalger.repo
zypper refresh
zypper install apache2-prefork