diff -uNr libXt-1.2.1/src/Shell.c libXt-1.2.1.mod/src/Shell.c
--- libXt-1.2.1/src/Shell.c	2021-01-24 14:47:39.000000000 +0000
+++ libXt-1.2.1.mod/src/Shell.c	2021-02-07 18:54:12.908568145 +0000
@@ -2017,9 +2017,7 @@
 
     while (timeout > 0) {
         if (_XtWaitForSomething(app, FALSE, TRUE, TRUE, TRUE, TRUE,
-#ifdef XTHREADS
                                 FALSE,
-#endif
                                 &timeout) != -1) {
             while (XCheckIfEvent(XtDisplay(w), event, isMine, (char *) &q)) {
                 if (q.done)
