Qt4 under fedora9

Qt4 under fedora9-general Linux technology-Linux programming and kernel information. The following is a detailed description. Just installed fedora9, which contains the built-in qt
Both qt3 and qt4
The built-in q4 seems to be of version 4.3.0.
However, when the qt4 designer is opened, only the window designer is returned and no program can be written.
Of course, this designer has much better functions than qt3.
But you still need to write programs.

First, I want to remove all the built-in qt of the system and re-compile qt4 by myself, but it is too troublesome.
Second, can someone tell me How to directly install the qt4 programming and compiling environment? Thank you!