From e0e65817e534420d5d04a635f964d97abf68e921 Mon Sep 17 00:00:00 2001
From: Richard Oudkerk <shibturn@gmail.com>
Date: Mon, 28 Jul 2014 23:01:02 +0100
Subject: [PATCH] Issue #21704: Fix build error for _multiprocessing when
 semaphores are not available.  Patch by Arfrever Frehtes Taifersar Arahesis.

---
 Misc/ACKS                                  | 1 +
 Misc/NEWS                                  | 3 +++
 Modules/_multiprocessing/multiprocessing.c | 2 ++
 3 files changed, 6 insertions(+)

diff --git a/Misc/ACKS b/Misc/ACKS
index fdf89d4200a..edd144cbf13 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -51,6 +51,7 @@ Ankur Ankan
 Jon Anglin
 Heidi Annexstad
 Ramchandra Apte
+Arfrever Frehtes Taifersar Arahesis
 Éric Araujo
 Alicia Arlen
 Jeffrey Armstrong
diff --git a/Misc/NEWS b/Misc/NEWS
index 9f7ca1dfcbb..92c9cb61bdb 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -27,6 +27,9 @@ Core and Builtins
 Library
 -------
 
+- Issue #21704: Fix build error for _multiprocessing when semaphores
+  are not available.  Patch by Arfrever Frehtes Taifersar Arahesis.
+
 - Fix repr(_socket.socket) on Windows 64-bit: don't fail with OverflowError
   on closed socket. repr(socket.socket) already works fine.
 
diff --git a/Modules/_multiprocessing/multiprocessing.c b/Modules/_multiprocessing/multiprocessing.c
index 1aaf3605714..4ae638eea5c 100644
--- a/Modules/_multiprocessing/multiprocessing.c
+++ b/Modules/_multiprocessing/multiprocessing.c
@@ -128,7 +128,9 @@ static PyMethodDef module_methods[] = {
     {"recv", multiprocessing_recv, METH_VARARGS, ""},
     {"send", multiprocessing_send, METH_VARARGS, ""},
 #endif
+#ifndef POSIX_SEMAPHORES_NOT_ENABLED
     {"sem_unlink", _PyMp_sem_unlink, METH_VARARGS, ""},
+#endif
     {NULL}
 };