It has been mentioned earlier that we are removing our dependency on the Qt libraries. By doing this, we hope to integrate better with the popular desktop environments out there, and we allow Opera to run without the need for a library that might or might not be installed on your system.
This means that you can run Opera without any graphical toolkit installed if you want to (plain X11), but if you do have toolkits installed, Opera will try to load and use them to integrate into the environment. Currently we are focusing on getting support for Gnome/GTK+ and KDE4/Qt4 into 10.5. The work on KDE4 integration is not at a stage yet where we think it can be used, so this pre-alpha release only has support for GTK. As a work in progress, you will notice that not all UI elements conform to their GTK specifications yet.
