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It should be a problem, otherwise the new OS would be so similar there would be little point in it existing...



A POSIX compatibility layer should be enough. You can easily run UNIX programs on Windows using Cygwin, for example.


What you want is a new and innovative OS that is also backwards/cross compatible and standards compliant?


Haiku actually does this. Haiku is not a UNIX, but there's a fairly complete POSIX layer for building UNIX programs. As far as I know, Syllable and SkyOS do something like this, too (I might be wrong, though).


What's the problem? The standards compliant layer would perhaps just not be as fast as the native metaphors.


You'd be surprised at what's possible. I'm actually working on one right now.




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