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maybe running the very new (and buggy) Mac OS X version 10.0 (Cheetah) or maybe the later 2001 Mac OS X version 10.1 (Puma) http://en.wikipedia.org/wiki/Mac_OS_X_v10.1

the pairs of ppc and i386 header files

I had heard of Apple internally testing Mac OS or Mac OS X on Intel-based hardware.

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Jobs specifically claimed that every version of OS X had been compiled for both PowerPC and Intel processors, though I can't remember if any proof of this was ever given.

NEXTSTEP ran on Intel, Sparc, Motorola, and I think PA-RISC at various times. No reason to believe they didn't have an Intel build of OS X from day one.

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