qt Build the extra compatibility package required by a few packages. More information at http://labs.qt.nokia.com/2010/06/22/qt-assistant-compat-version-available-as-extra-source-package/ Add support for exceptions - like catching them inside the event loop (recommended by Nokia) Enable the Qt3Support libraries for Qt4. Note that this does not mean you can compile pure Qt3 programs with Qt4. Build the qttracereplay utility which is required to play drawings recorded with the trace graphicssystem engine Enable dev-libs/glib eventloop support