Hello Mikhail, I have used differing versions of qt. The technique I used was this: I compiled the version of qt that I wanted, making certain that in the 'configure' file, I set the $prefix parameter to a specific directory that served as a label for the version ( such as qt-3.3 ). I compiled and installed according to the instructions. I then set up a syslink /usr/lib/qt -> /usr/lib/qt-3.3 and set the environment variable QTLIBS = /usr/lib/qt. So when I wanted to change the version of qt, all I had to do was to change the symlink to point to the other version. Hope this helps. Basil On Friday 15 July 2005 22:57, Mikhail Ramendik wrote: > Hello, > > I'd like to compile and install qt 4. I need it for some new open source > project I'm participating in. > > But I don't want it to interfere with the existing qt 3. (Moreover, I want > to be able to update qt 3.x from RPM without affecting qt 4). > > How do I do this? ___________________________________________________ . Account management: https://mail.kde.org/mailman/listinfo/kde. Archives: http://lists.kde.org/. More info: http://www.kde.org/faq.html.