Issue #9586: Merge

diff --cc Misc/NEWS
index c2c1c336e75b411fad8192139f2647772d361a74,a7e25344a99d19b7ace4a488c936f8d5a4bddd70..efd4343af6bc4cdcf5ef5d327657387bf819f969
--- 1/Misc/NEWS
--- 2/Misc/NEWS
+++ b/Misc/NEWS
@@@ -124,11 -189,10 +124,13 @@@ Core and Builtin
  Library
  -------
  
+ - Issue #9586: Redefine SEM_FAILED on MacOSX to keep compiler happy.
+ 
  - Issue 10527: make multiprocessing use poll() instead of select() if available.
  
 +- Issue #16688: Fix backreferences did make case-insensitive regex fail on
 +  non-ASCII strings. Patch by Matthew Barnett.
 +
  - Issue #16485: Fix file descriptor not being closed if file header patching
    fails on closing of aifc file.
  

diff --cc Modules/_multiprocessing/semaphore.c
Simple merge