^CMake Warning \(dev\) in CMakeLists.txt:
  AUTOGEN: No valid Qt version found for target main.  AUTOMOC, AUTOUIC,
  AUTORCC disabled.  Consider adding:

    find_package\(Qt5 COMPONENTS Widgets\)

  to your CMakeLists.txt file.
This warning is for project developers.  Use -Wno-dev to suppress it.