When compiling with -Wredundant-decls gcc spots a redundant declaration:

flub@laurie:sandbox$ cat test.c 
#include <Python.h>
#include <stdio.h>

int main(void)
{
        printf("hello\n");
        return 0;
}
flub@laurie:sandbox$ gcc -I /usr/local/include/python3.0/
-Wredundant-decls test.c 
In file included from /usr/local/include/python3.0/Python.h:102,
                 from test.c:1:
/usr/local/include/python3.0/pyerrors.h:155: warning: redundant
redeclaration of ‘PyExc_BufferError’
/usr/local/include/python3.0/pyerrors.h:147: warning: previous
declaration of ‘PyExc_BufferError’ was here
flub@laurie:sandbox$

This is annoying since when developing extension modules I usually use
-Werror on top of -Wredundant-decls (among others).

Regards
Floris