Thanks for the replies guys.
I really appreciate the help.
@ChrisW67: Can you please help me out in figuring out this problem. I need it urgently to submit my project in college. I am stuck at this point. It's too frustating. I have installed Qt 4.7.3 SDK in /home/pkr/QtSDK/....

Now after getting some response from different forum I have downloaded the sources file from here (4.8.2). Now I am not able to understand anything how to install it. Please help me out. I need the help and not able to understand anything. I will be greatful to you