How to run Qt programs----simple one

[wysota]

then why cant kdevelop do so??
if kdevelop starts taking the new qt path then i think the problem should get solved. can u please tell me how should i do it ?

The easiest way (that's how I often do it) is to set the path as a custom environment variable inside the project configuration. Alternatively, you cat set the path in your user profile, so that kdevelop always picks the right path or you can create a custom desktop icon for kdevelop and modify its properties and set the path there.