Quote Originally Posted by estanisgeyer View Post
You can have two different versions of the Library of QT installed on the system?
Yes, you can.

What happens is that I am developing an application with QT 4.4.2. Let's say KDE4 on another computer is based on the QT 4.4.0, I like to not give separate problems in applications?
Qt is binary compatible within a minor release, so your application will work with any 4.4.x Qt without recompilation.

What I did then was to copy the libraries to the same directory that I installed on my machine for development,
That's a bad idea. Use the version of Qt installed on the target system.