From 67a2b0b7713e40dea7762b7d7764ae18fe967561 Mon Sep 17 00:00:00 2001
From: Erik Bray <erik.m.bray@gmail.com>
Date: Fri, 27 Oct 2017 12:01:17 +0200
Subject: [PATCH] Fix _socket module compilation on Cygwin. (GH-4137) (cherry
 picked from commit 63ae04461fb0cc93ca57cd151103a8dd295581d6)

---
 Modules/socketmodule.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Modules/socketmodule.c b/Modules/socketmodule.c
index da84291edcf908..f6cfed459f276c 100644
--- a/Modules/socketmodule.c
+++ b/Modules/socketmodule.c
@@ -240,7 +240,7 @@ if_indextoname(index) -- return the corresponding interface name\n\
 # include <ctype.h>
 #endif
 
-#ifdef __APPLE__
+#if defined(__APPLE__) || defined(__CYGWIN__)
 # include <sys/ioctl.h>
 #endif