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diff --git a/nx-X11/lib/src/Sync.c b/nx-X11/lib/src/Sync.c
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+/*
+
+Copyright 1986, 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.
+
+*/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+#include "Xlibint.h"
+
+/* Synchronize with errors and events, optionally discarding pending events */
+
+int
+XSync (
+ register Display *dpy,
+ Bool discard)
+{
+ xGetInputFocusReply rep;
+ _X_UNUSED register xReq *req;
+
+ LockDisplay(dpy);
+ GetEmptyReq(GetInputFocus, req);
+ (void) _XReply (dpy, (xReply *)&rep, 0, xTrue);
+
+ if (discard && dpy->head) {
+ _XQEvent *qelt;
+
+ for (qelt=dpy->head; qelt; qelt=qelt->next)
+ qelt->qserial_num = 0;
+
+ ((_XQEvent *)dpy->tail)->next = dpy->qfree;
+ dpy->qfree = (_XQEvent *)dpy->head;
+ dpy->head = dpy->tail = NULL;
+ dpy->qlen = 0;
+ }
+ UnlockDisplay(dpy);
+ return 1;
+}
+