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other than license differences i don't think there will be
much difference between x.org and xfree86:
http://www.unixville.com/?q=node/view/34
as far as alpha support [NetBSD]is concerned, there needs to be a 
complete forward write of netbsd files in xc/programs...../os-suppot/bus
directory. here the netbsd pci library for alpha needs to called. -my 
2cents.
-Mel

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