[Qt-interest] linker problem

[rafal]

Hi,  
when i try compile sample code from QTCreator i  see this error,  


/usr/bin/ld: cannot find -lXext

collect2: ld returned 1 exit status

make: *** [calculatorform] Błąd 1

I trying find resolution for my problem on Internet, I  saw some
sugestion abou installing  software, for exemple this link: 
http://lists.trolltech.com/pipermail/qt-creator/2009-March/002348.html
http://stackoverflow.com/questions/764928/usr-bin-ld-cannot-find-lfreetype-why-and-how-can-i-make-it-work

but i  have this pack,  and I still can't compile sample code.. 



Im using Ubuntu 9.4.