libQt5Gui5 from home:linux4humans:qt_5.15 project
Select Your Operating System
Add repository and install manually
For openSUSE Evergreen 11.4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:linux4humans:qt_5.15/openSUSE_Evergreen_11.4/home:linux4humans:qt_5.15.repo zypper refresh zypper install libQt5Gui5