--- libedit-20120311-3.0/src/editline/readline.h	2011-02-26 23:42:59.000000000 +0100
+++ libedit-20120311-3.0/src/editline/readline.h	2012-05-03 19:00:49.211244803 +0200
@@ -75,7 +75,7 @@ typedef KEYMAP_ENTRY *Keymap;
 
 #ifndef CTRL
 #include <sys/ioctl.h>
-#if !defined(__sun) && !defined(__hpux) && !defined(_AIX)
+#if !defined(__sun) && !defined(__hpux) && !defined(_AIX) && !defined(__CYGWIN__)
 #include <sys/ttydefaults.h>
 #endif
 #ifndef CTRL

--- a/src/read.c
+++ b/src/read.c
@@ -51,6 +51,7 @@ __RCSID("$NetBSD: read.c,v 1.109 2025/01/03 00:40:08 rillig Exp $");
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
+#include <sys/ioctl.h>
 
 #include "el.h"
 #include "fcns.h"