Qt5 QuickControls2

[robberthofmanfm]

Just want to document this here, because it took me a while to find out the solution.

--- stderr: ignition-gui7                           
CMake Warning at ~/gazebo_garden_ws/install/share/cmake/ignition-cmake3/cmake3/IgnUtils.cmake:197 (find_package):
  Found package configuration file:

    /usr/lib/x86_64-linux-gnu/cmake/Qt5/Qt5Config.cmake

  but it set Qt5_FOUND to FALSE so package "Qt5" is considered to be NOT
  FOUND.  Reason given by package:

  Failed to find Qt5 component "QuickControls2" config file at
  "/usr/lib/x86_64-linux-gnu/cmake/Qt5QuickControls2/Qt5QuickControls2Config.cmake"

Resolved by
sudo apt install qtquickcontrols2-5-dev