qmake configuration

hi!!

I have installed qt 4.6.1 for linux platform. i followed all the instructions given in the "C++ GUI programming with QT 4 2nd edition.
the IDE, libraries are installed properly.

First i installed the qt-x11-opensource-2010.01.bin
then in terminal i configured as ./configure.
In which i followed the instructions asked automatically in the terminal.
After that i was asked to do 'gmake'.
It took almost 3 hours to install the libraries,demos,examples.
After that i did gmake install.
In the last i did the path environment settings as told in the reference guide of QT4.

I did a small exercise of creating an application in QT4.6.1 but it doesn't get compiled.
It asks..."QT version not set".asks me to configure qmake.

I am unable to configure qmake....
PLZ guide what to do in this case????