never used if `-DENABLED_GUI=FALSE` is passed instead. The implicit default is
`-DENABLE_GUI=AUTO`, which will build the GUI if Qt is available, using the
bundled QJSON if it is not found on the system.
never used if `-DENABLED_GUI=FALSE` is passed instead. The implicit default is
`-DENABLE_GUI=AUTO`, which will build the GUI if Qt is available, using the
bundled QJSON if it is not found on the system.