Open in Qt Creator GUI:
qtcreator systray.pro
Or on the command line:
$ qmake
$ make
...
$ ./lima-gui
See https://doc.qt.io/qt-5/qtwidgets-desktop-systray-example.html
Tux icon from the Crystal project by Everaldo Coelho. The icons are licensed under the GNU Lesser General Public License (LGPL).
Unix builds (Linux, Mac) will need to install qtermwidget dependency:
See https://github.com/lxqt/qtermwidget (not available on Windows)