libQt5Gui5 from KDE:Qt:5.6:Unsupported project
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Add repository and install manually
For openSUSE Leap 42.3 Update ports run the following as root:
zypper addrepo https://download.opensuse.org/repositories/KDE:Qt:5.6:Unsupported/openSUSE_Leap_42.3_Update_ports/KDE:Qt:5.6:Unsupported.repo zypper refresh zypper install libQt5Gui5
For openSUSE Leap 42.3 Update run the following as root:
zypper addrepo https://download.opensuse.org/repositories/KDE:Qt:5.6:Unsupported/openSUSE_Leap_42.3_Update/KDE:Qt:5.6:Unsupported.repo zypper refresh zypper install libQt5Gui5