[Scribus] Compile error 1.2.1 on Ubuntu

[Jozsef Mak]

Yesterday i tried to build Scribus 1.2.1 from source and I got the following 
error.

checking for Qt... configure: error: Qt (>= Qt 3.3) (library qt-mt) not 
found. Please check your installation!
For more details about this problem, look at the end of config.log.
Make sure that you have compiled Qt with thread support!

Any idea what this means?
My distro is ubuntu.

jozsefmak