By the way, Qt is a cross-platform application and UI framework. It can be used to develop web-enabled applications and user interfaces once and deploy them across Windows, Mac, Linux/X11, embedded Linux, Windows CE and Symbian.
Download the binaries from http://qt.nokia.com/. As of this writing, the latest version is 4.6 which comes with a lot of new features especially the multi-touch aware which is pretty much what is expected from latest generation of smartphone applications.
Change to the directory where the file was downloaded, like:
What we just did was to make the file executable. Finally, install the application by running the following command:
See below for screen capture while installing Qt.
Note that Qt SDK needs additional software to work properly, like gcc and related libraries.