[issue9046] Python 2.7rc2 doesn't build on Mac OS X 10.4

[Ronald Oussoren]

Ronald Oussoren <ronaldoussoren at mac.com> added the comment:

The search code must look in the SDK and not fall back on looking into the system to avoid finding new headers and libraries when trying to build using an older SDK on a newer system.

I don't think this is a problem at the moment, but it could be in the future. 

The reason I added the SDK support code was that Snow Leopard contained a newer version of the OpenSSL libraries and the Python build picked up version information from the system version of OpenSSL instead of the SDK, and that resulted in a disfunctional build (IIRC hashlib was incomplete and that caused numerous test failures).

Falling back to looking in the current system would be needed when looking for a file that isn't a header of library, but AFAIK we don't do that in setup.py.

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