qt6-creator from home:rhabacker:branches:KDE:Qt6 project
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Add repository and install manually
For openSUSE Leap 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:rhabacker:branches:KDE:Qt6/openSUSE_Leap_15.6/home:rhabacker:branches:KDE:Qt6.repo zypper refresh zypper install qt6-creator