For totest run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:thiagomacieira:branches:openSUSE:Factory/totest/home:thiagomacieira:branches:openSUSE:Factory.repo
zypper refresh
zypper install libQt5Gui5
For standard run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:thiagomacieira:branches:openSUSE:Factory/standard/home:thiagomacieira:branches:openSUSE:Factory.repo
zypper refresh
zypper install libQt5Gui5
For snapshot run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:thiagomacieira:branches:openSUSE:Factory/snapshot/home:thiagomacieira:branches:openSUSE:Factory.repo
zypper refresh
zypper install libQt5Gui5