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Oops, I forgot the -I option, but that doesn't really make a difference.

For Python 2.5:

gcc -I /usr/local/include/python2.5 foobar.c 

--> no error message

For Python 2.4:

gcc -I /Library/Frameworks/Python.framework/Versions/2.4/include/
python2.4 foobar.c 
In file included from /Library/Frameworks/Python.framework/Versions/2.4/
include/python2.4/Python.h:55,
                 from foo.h:1,
                 from foobar.c:1:
/Library/Frameworks/Python.framework/Versions/2.4/include/python2.4/
pyport.h:396: warning: 'struct winsize' declared inside parameter list
/Library/Frameworks/Python.framework/Versions/2.4/include/python2.4/
pyport.h:397: warning: 'struct winsize' declared inside parameter list
In file included from foobar.c:2:
bar.h:4: error: redefinition of typedef 'Py_ssize_t'
foo.h:4: error: previous declaration of 'Py_ssize_t' was here