Fix _socket module compilation on Cygwin. (GH-4137) (GH-4145)

(cherry picked from commit 63ae04461fb0cc93ca57cd151103a8dd295581d6)

diff --git a/Modules/socketmodule.c b/Modules/socketmodule.c
index b455021c2fd4ec07a6ef77df17319a0445096473..36920f7f8633f5fe464924ff0c3f8b31d477aed4 100644 (file)
--- a/Modules/socketmodule.c
+++ b/Modules/socketmodule.c
@@ -240,7 +240,7 @@ http://cvsweb.netbsd.org/bsdweb.cgi/src/lib/libc/net/getaddrinfo.c.diff?r1=1.82&
 # include <ctype.h>
 #endif
 
-#if defined(__APPLE__) || defined(__NetBSD__)
+#if defined(__APPLE__) || defined(__CYGWIN__) || defined(__NetBSD__)
 # include <sys/ioctl.h>
 #endif