./configure from Python 2.5 fails when testing for getaddrinfo, which is part of QNX (http://www.qnx.com/developers/docs
/6.3.2/neutrino/lib_ref/g/getaddrinfo.html)

These are the error messages:

$ gcc -o conftest -O2  conftest.c -lsocket
conftest.c: In function `main':
conftest.c:304: error: storage size of `hints' isn't known
conftest.c:310: error: `AI_PASSIVE' undeclared (first use in this function)
conftest.c:310: error: (Each undeclared identifier is reported only once
conftest.c:310: error: for each function it appears in.)
conftest.c:313: warning: passing arg 4 of `getaddrinfo' from incompatible pointer type
conftest.c:317: error: dereferencing pointer to incomplete type
conftest.c:318: error: dereferencing pointer to incomplete type
conftest.c:319: error: dereferencing pointer to incomplete type
conftest.c:320: error: dereferencing pointer to incomplete type
conftest.c:320: error: dereferencing pointer to incomplete type
conftest.c:322: error: `NI_NUMERICHOST' undeclared (first use in this function)
conftest.c:322: error: `NI_NUMERICSERV' undeclared (first use in this function)
conftest.c:325: error: dereferencing pointer to incomplete type
conftest.c:372: warning: passing arg 1 of `freeaddrinfo' from incompatible pointer type
conftest.c:377: warning: passing arg 1 of `freeaddrinfo' from incompatible pointer type

The solution is to not define 

#define _XOPEN_SOURCE 600
#define _XOPEN_SOURCE_EXTENDED 1

and everything works as expected.


Is this behavior intentional?

I'll fix this behavior through the definition 
define_xopen_source=no
in the configure script.

The conftest.c is attached. The file does include the relevant section of the config.log, too.