Install Qt in RHEL for CMake GUI

Qt GUI can be installed in RHEL-like Linux from the CRB repository.

dnf config-manager --set-enabled crb

dnf install qt6-devel

Qt can be used to build cmake-gui like:

# from CMake source directory
cmake -Bbuild -DBUILD_QtDialog=ON

cmake --build build

This results in “build/bin/cmake-gui” being built.