Para 15.7 execute o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/home:wicked:qubes-build/15.7/home:wicked:qubes-build.repo
zypper refresh
zypper install cmake-gui
Para 15.6 execute o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/home:wicked:qubes-build/15.6/home:wicked:qubes-build.repo
zypper refresh
zypper install cmake-gui
Para 15.5 execute o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/home:wicked:qubes-build/15.5/home:wicked:qubes-build.repo
zypper refresh
zypper install cmake-gui