[issue11888] Add C99's log2() function to the math library

[Mark Dickinson]

Mark Dickinson <dickinsm at gmail.com> added the comment:

Victor, what do you think about simply #undefining HAVE_LOG2 on Tiger (e.g. in pyport.h), so that the fallback log2 version is used there instead of the system version?

Does anyone know the appropriate preprocessor check for OS X <= 10.4?  I can get as far as "#ifdef __APPLE__", but don't know how to check for specific versions of OS X.

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