Compared to Debian our Qt 4 adds some links needed for the Jambi build system. It adds a patch to load 32 bit plugins on 64 bit systems (needed for skype). Other bits are Ubuntu specific (translations, old package replaces, forcing using bash for shell). http://people.canonical.com/~jriddell/merges/qt4-x11_4.6.0~beta1-1ubuntu1.debdiff Jonathan