Linked by Eugenia Loli-Queru on Sat 19th Aug 2006 01:47 UTC, submitted by elsewhere
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Member since:
2005-07-06
That's up to your distributor. For backwords compatibility they just have to have qt3 and kdelibs3 installed alongside qt4 and kdelibs4. They shouldn't have any problems doing this, as they did exactly that when KDE 2 was first released, and again when KDE 3 was released.
As regards source compatibility, KDE and Qt have some special compatibility wrappers to help people porting software, but in general it's better to go completely 4.0: there are significant benefits in terms of code cleaniness to be had by the switch.