Qt X11 Extras
Qt X11 Extras enables the Qt programmer to write applications for the Linux/X11 platform. Applications developed with Qt can also be deployed across several other desktop and embedded operating systems without having to rewrite the source code.
To include the definitions of the module's classes, use the following directive:
To link against the module, add this line to your qmake
QT += x11extras
Requirements for using X11 with Qt: Qt for X11 Requirements
Qt X11 Extras is available under commercial licenses from The Qt Company. In addition, it is available under free software licenses. Since Qt 5.4, these free software licenses are GNU Lesser General Public License, version 3, or the GNU General Public License, version 2. See Qt Licensing for further details.
Links to the API reference materials: