Patch #650415: Avoid redefinition of macros.
diff --git a/Python/thread_pthread.h b/Python/thread_pthread.h
index 6f6fde4..8067121 100644
--- a/Python/thread_pthread.h
+++ b/Python/thread_pthread.h
@@ -79,14 +79,26 @@
/* set default attribute object for different versions */
#if defined(PY_PTHREAD_D4) || defined(PY_PTHREAD_D7)
+#if !defined(pthread_attr_default)
# define pthread_attr_default pthread_attr_default
+#endif
+#if !defined(pthread_mutexattr_default)
# define pthread_mutexattr_default pthread_mutexattr_default
+#endif
+#if !defined(pthread_condattr_default)
# define pthread_condattr_default pthread_condattr_default
+#endif
#elif defined(PY_PTHREAD_STD) || defined(PY_PTHREAD_D6)
+#if !defined(pthread_attr_default)
# define pthread_attr_default ((pthread_attr_t *)NULL)
+#endif
+#if !defined(pthread_mutexattr_default)
# define pthread_mutexattr_default ((pthread_mutexattr_t *)NULL)
+#endif
+#if !defined(pthread_condattr_default)
# define pthread_condattr_default ((pthread_condattr_t *)NULL)
#endif
+#endif
/* Whether or not to use semaphores directly rather than emulating them with