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The GCC version that comes with Red Hat 7.0 is not fit for
distribution.

In particular, it defines LONG_BIT as 64 on 32-bit machines under
certain circumstances, and letting this go unchecked would cause
it to generate bad code for various Python arithmetic operations.

The solution is to download a valid version of GCC.

See

http://www.python.org/cgi-
bin/moinmoin/FrequentlyAskedQuestions#line53

for more information.