Since qt is the gadget toolkit used by khtml, the AtheOS khtml port might still be based on that (just a guess) which would have made porting significantly easier. Apple, on the other hand, already has done the untie-khtml-from-qt-and-linux job
Don't forget that Apples WebCore consists of the KHTML library plus the KWQ library. The KWQ library implements the Qt functionality needed by KHTML. The calls to the Qt toolkit is still in KHTML. A port to Amiga would require a similar adapter library as the KWQ to be created for Amiga. Apples library could be used as a reference...
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Glenn Hisdal