For SLE 15 SP2 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:interstar001:Centreon/SLE_15_SP2/home:interstar001:Centreon.repo
zypper refresh
zypper install libqt4-devel-doc-data
For SLE 15 SP1 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:interstar001:Centreon/SLE_15_SP1/home:interstar001:Centreon.repo
zypper refresh
zypper install libqt4-devel-doc-data
For SLE 15 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:interstar001:Centreon/SLE_15/home:interstar001:Centreon.repo
zypper refresh
zypper install libqt4-devel-doc-data