Fix _socket module compilation on Cygwin. (#4137)

diff --git a/Modules/socketmodule.c b/Modules/socketmodule.c
index 0758f9bd4099c19fa44b46482e9000848277ce9f..6f114efe31eddf5efee507e56f56605cd3a371ba 100644 (file)
--- a/Modules/socketmodule.c
+++ b/Modules/socketmodule.c
@@ -234,7 +234,7 @@ http://cvsweb.netbsd.org/bsdweb.cgi/src/lib/libc/net/getaddrinfo.c.diff?r1=1.82&
 # include <ctype.h>
 #endif
 
-#ifdef __APPLE__
+#if defined(__APPLE__) || defined(__CYGWIN__)
 # include <sys/ioctl.h>
 #endif