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I don't understand this item listed under Long-Term Goals:
Build PureDarwin on BSD/linux.
Does this mean porting their not-yet-created desktop environment to a BSD variant and Linux? Are they planning to abandon the Darwin kernel, or do they intend to maintain their DE on three different kernel/library stacks?
Not sure. Maybe they're going to replace the nasty proprietary bits with tools and libraries from Linux and BSD?
That's sort of how I'm understanding it, they're talking about the build process specifically and want to re-base their toolset to BSD/Linux. Not sure what their current build process entails but like you said it could be they're currently stuck with some sort of proprietary / Apple specific software.