$OpenBSD: patch-widget_c,v 1.1 2002/01/14 13:47:22 naddy Exp $
--- widget.c.orig	Sun Jul 14 19:49:09 1996
+++ widget.c	Mon Jan 14 14:41:27 2002
@@ -973,6 +973,10 @@ post_realize_config(widgets_t *m)
 	delw = XmInternAtom(display, "WM_DELETE_WINDOW", False);
 }
 
+static XtSignalId sigid;
+void deliverSIGIO() {
+	XtNoticeSignal(sigid);
+}
 
 /*
  * register_callbacks
@@ -985,7 +989,7 @@ post_realize_config(widgets_t *m)
  *	Nothing
  */
 void
-register_callbacks(widgets_t *m)
+register_callbacks(widgets_t *m, XtAppContext app)
 {
 	int	i;
 
@@ -1126,6 +1130,15 @@ register_callbacks(widgets_t *m)
 		XmNfocusCallback,
 		(XtCallbackProc) mx_focuschg, (XtPointer) m->form
 	);
+
+#if defined(__NetBSD__) || defined(__OpenBSD__)
+	/*
+	 * Mixer SIGIO change callback
+	 */
+	sigid = XtAppAddSignal(app,
+		(XtSignalCallbackProc) mx_change, (XtPointer) 0
+	);
+#endif
 
 	/*
 	 * Install WM_DELETE_WINDOW handler