mmuman was still talking about it recently, but the issue is that the compiler used under BeOS is proprietary - Metrowerks mwcc, and is basically DOA now (do they even still make is commercially available?.) The PowerPC version of BeOS uses the proprietary Apple PEF exe format too, and there are almost no modern compilers that support that format (Retro68 is the only one I know of.) Haiku is therefore likely to not support anything legacy from BeOS PowerPC, and that makes even bootstrapping difficult, as you need a whole new OS to run the new code.