diff -up x3270-3.3.12ga12/c3270-3.3/keypad.c.sigill x3270-3.3.12ga12/c3270-3.3/keypad.c
--- x3270-3.3.12ga12/c3270-3.3/keypad.c.sigill	2021-11-01 15:32:26.917775131 +0100
+++ x3270-3.3.12ga12/c3270-3.3/keypad.c	2021-11-01 15:35:17.613383589 +0100
@@ -52,7 +52,7 @@
 # include "windows.h"
 #endif /*]*/
 
-extern int screen_changed; /* XXX Hack! */
+extern bool screen_changed; /* XXX Hack! */
 
 /* Sensitivity map: A rectangular region and a callback function. */
 typedef struct {
diff -up x3270-3.3.12ga12/c3270-3.3/menubar.c.sigill x3270-3.3.12ga12/c3270-3.3/menubar.c
--- x3270-3.3.12ga12/c3270-3.3/menubar.c.sigill	2021-11-01 15:37:13.147864928 +0100
+++ x3270-3.3.12ga12/c3270-3.3/menubar.c	2021-11-01 15:37:23.382924337 +0100
@@ -73,7 +73,7 @@
 # include "windows.h"
 #endif /*]*/
 
-extern int screen_changed; /* XXX: Hack! */
+extern bool screen_changed; /* XXX: Hack! */
 
 /*
  * The menus look like this:
diff -up x3270-3.3.12ga12/x3270-3.3/keypad.c.sigill x3270-3.3.12ga12/x3270-3.3/keypad.c