Patch #1163249 - Correctly handle _POSIX_SEMAPHORES == -1 to mean no
support for posix semaphores.

Python/thread_pthread.h

diff --git a/Python/thread_pthread.h b/Python/thread_pthread.h
index dd1616c..d754005 100644
--- a/Python/thread_pthread.h
+++ b/Python/thread_pthread.h
@@ -16,9 +16,13 @@
    family of functions must indicate this by defining
    _POSIX_SEMAPHORES. */   
 #ifdef _POSIX_SEMAPHORES
+#if _POSIX_SEMAPHORES == -1
+#define HAVE_BROKEN_POSIX_SEMAPHORES
+#else
 #include <semaphore.h>
 #include <errno.h>
 #endif
+#endif
 
 #if !defined(pthread_attr_default)
 #  define pthread_attr_default ((pthread_attr_t *)NULL)