see also
http://serverfault.com/questions/388865/building-python3-on-a-redhat-5-machine

upstream fix:
http://hg.python.org/cpython/rev/fe1dfc066a38

--- Python-3.2.3/Modules/_posixsubprocess.c~	2012-04-11 09:54:07.000000000 +0300
+++ Python-3.2.3/Modules/_posixsubprocess.c	2012-07-26 10:58:29.616131665 +0300
@@ -37,6 +37,9 @@
 
 #define POSIX_CALL(call)   if ((call) == -1) goto error
 
+#ifndef O_CLOEXEC
+#define O_CLOEXEC   02000000    /* set close_on_exec */
+#endif
 
 /* Maximum file descriptor, initialized on module load. */
 static long max_fd;