Setting up the Qt GUI library

The Qt library is a C++ framework that was designed to create a multi-platform application. In Linux, this library is the foundation for the KDE desktop. Its counterpart is the GTK+ library, the foundation for Gnome desktop. However, the Qt library has stepped up its game. You can use the Qt library to create applications on Android and iOS. People have sometimes mistaken the Qt library as a library that only creates GUI applications. However, the Qt library comprises non-GUI libraries as well, for example, data storage, multimedia, and networking. The Qt library even contains a threading library! In the past, you could create an open source application for free with the Qt library. However, if you want to create a proprietary application with the Qt library, you must pay for the license. You can now have a bit more flexibility when it comes to using...