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diff --git a/nx-X11/lib/X11/ChkMaskEv.c b/nx-X11/lib/X11/ChkMaskEv.c
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+/* $Xorg: ChkMaskEv.c,v 1.4 2001/02/09 02:03:31 xorgcvs Exp $ */
+/*
+
+Copyright 1985, 1987, 1998 The Open Group
+
+Permission to use, copy, modify, distribute, and sell this software and its
+documentation for any purpose is hereby granted without fee, provided that
+the above copyright notice appear in all copies and that both that
+copyright notice and this permission notice appear in supporting
+documentation.
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+Except as contained in this notice, the name of The Open Group shall not be
+used in advertising or otherwise to promote the sale, use or other dealings
+in this Software without prior written authorization from The Open Group.
+
+*/
+/* $XFree86: xc/lib/X11/ChkMaskEv.c,v 3.5 2001/10/28 03:32:29 tsi Exp $ */
+
+#define NEED_EVENTS
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+#include "Xlibint.h"
+
+extern long const _Xevent_to_mask[];
+
+#define AllPointers (PointerMotionMask|PointerMotionHintMask|ButtonMotionMask)
+#define AllButtons (Button1MotionMask|Button2MotionMask|Button3MotionMask|\
+ Button4MotionMask|Button5MotionMask)
+
+/*
+ * Check existing events in queue to find if any match. If so, return.
+ * If not, flush buffer and see if any more events are readable. If one
+ * matches, return. If all else fails, tell the user no events found.
+ */
+
+Bool XCheckMaskEvent (dpy, mask, event)
+ register Display *dpy;
+ long mask; /* Selected event mask. */
+ register XEvent *event; /* XEvent to be filled in. */
+{
+ register _XQEvent *prev, *qelt;
+ unsigned long qe_serial = 0;
+ int n; /* time through count */
+
+ LockDisplay(dpy);
+ prev = NULL;
+ for (n = 3; --n >= 0;) {
+ for (qelt = prev ? prev->next : dpy->head;
+ qelt;
+ prev = qelt, qelt = qelt->next) {
+ if ((qelt->event.type < LASTEvent) &&
+ (_Xevent_to_mask[qelt->event.type] & mask) &&
+ ((qelt->event.type != MotionNotify) ||
+ (mask & AllPointers) ||
+ (mask & AllButtons & qelt->event.xmotion.state))) {
+ *event = qelt->event;
+ _XDeq(dpy, prev, qelt);
+ UnlockDisplay(dpy);
+ return True;
+ }
+ }
+ if (prev)
+ qe_serial = prev->qserial_num;
+ switch (n) {
+ case 2:
+ _XEventsQueued(dpy, QueuedAfterReading);
+ break;
+ case 1:
+ _XFlush(dpy);
+ break;
+ }
+ if (prev && prev->qserial_num != qe_serial)
+ /* another thread has snatched this event */
+ prev = NULL;
+ }
+ UnlockDisplay(dpy);
+ return False;
+}