KDE is split in to several packages already, kdelibs, kdebase, kdeadmin, kdeedu, etc. So a change in one doesn't necessarily mean you have to rebuild the whole of KDE.
KDE is split in to several packages already, kdelibs, kdebase, kdeadmin, kdeedu, etc. So a change in one doesn't necessarily mean you have to rebuild the whole of KDE.