Most work is to cope with the variety of definitions between compilers Visual C++ v1.52 & 4-6 and Borland and Symantec on Windows.
automatically define _Macintosh_OSX if gcc ProjectBuilder build
automatically define _Macintosh_OSX if XCode build
This graph shows which files directly or indirectly include this file:

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| #define | _MSDOS |
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1.3.5