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diff --git a/X11/extensions/syncconst.h b/X11/extensions/syncconst.h
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+/*
+
+Copyright 1991, 1993, 1994, 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.
+
+*/
+
+/***********************************************************
+Copyright 1991,1993 by Digital Equipment Corporation, Maynard, Massachusetts,
+and Olivetti Research Limited, Cambridge, England.
+
+                        All Rights Reserved
+
+Permission to use, copy, modify, and distribute this software and its
+documentation for any purpose and without fee is hereby granted,
+provided that the above copyright notice appear in all copies and that
+both that copyright notice and this permission notice appear in
+supporting documentation, and that the names of Digital or Olivetti
+not be used in advertising or publicity pertaining to distribution of the
+software without specific, written prior permission.
+
+DIGITAL AND OLIVETTI DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
+SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+FITNESS, IN NO EVENT SHALL THEY BE LIABLE FOR ANY SPECIAL, INDIRECT OR
+CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
+USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
+OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+PERFORMANCE OF THIS SOFTWARE.
+
+******************************************************************/
+
+#ifndef _SYNCCONST_H_
+#define _SYNCCONST_H_
+
+#define SYNC_NAME "SYNC"
+
+#define SYNC_MAJOR_VERSION	3
+#define SYNC_MINOR_VERSION	0
+
+
+#define XSyncCounterNotify              0
+#define XSyncAlarmNotify		1
+#define XSyncAlarmNotifyMask 		(1L << XSyncAlarmNotify)
+
+#define XSyncNumberEvents		2L
+
+#define XSyncBadCounter			0L
+#define XSyncBadAlarm			1L
+#define XSyncNumberErrors		(XSyncBadAlarm + 1)
+
+/*
+ * Flags for Alarm Attributes
+ */
+#define XSyncCACounter			(1L<<0)
+#define XSyncCAValueType		(1L<<1)
+#define XSyncCAValue			(1L<<2)
+#define XSyncCATestType			(1L<<3)
+#define XSyncCADelta			(1L<<4)
+#define XSyncCAEvents			(1L<<5)
+
+/*  The _XSync macros below are for library internal use only.  They exist
+ *  so that if we have to make a fix, we can change it in this one place
+ *  and have both the macro and function variants inherit the fix.
+ */
+
+#define _XSyncIntToValue(pv, i)     ((pv)->hi=((i<0)?~0:0),(pv)->lo=(i))
+#define _XSyncIntsToValue(pv, l, h) ((pv)->lo = (l), (pv)->hi = (h))
+#define _XSyncValueGreaterThan(a, b)\
+    ((a).hi>(b).hi || ((a).hi==(b).hi && (a).lo>(b).lo))
+#define _XSyncValueLessThan(a, b)\
+    ((a).hi<(b).hi || ((a).hi==(b).hi && (a).lo<(b).lo))
+#define _XSyncValueGreaterOrEqual(a, b)\
+    ((a).hi>(b).hi || ((a).hi==(b).hi && (a).lo>=(b).lo))
+#define _XSyncValueLessOrEqual(a, b)\
+    ((a).hi<(b).hi || ((a).hi==(b).hi && (a).lo<=(b).lo))
+#define _XSyncValueEqual(a, b)	((a).lo==(b).lo && (a).hi==(b).hi)
+#define _XSyncValueIsNegative(v) (((v).hi & 0x80000000) ? 1 : 0)
+#define _XSyncValueIsZero(a)	((a).lo==0 && (a).hi==0)
+#define _XSyncValueIsPositive(v) (((v).hi & 0x80000000) ? 0 : 1)
+#define _XSyncValueLow32(v)	((v).lo)
+#define _XSyncValueHigh32(v)	((v).hi)
+#define _XSyncValueAdd(presult,a,b,poverflow) {\
+	int t = (a).lo;\
+	Bool signa = XSyncValueIsNegative(a);\
+	Bool signb = XSyncValueIsNegative(b);\
+	((presult)->lo = (a).lo + (b).lo);\
+	((presult)->hi = (a).hi + (b).hi);\
+	if (t>(presult)->lo) (presult)->hi++;\
+	*poverflow = ((signa == signb) && !(signa == XSyncValueIsNegative(*presult)));\
+     }
+#define _XSyncValueSubtract(presult,a,b,poverflow) {\
+	int t = (a).lo;\
+	Bool signa = XSyncValueIsNegative(a);\
+	Bool signb = XSyncValueIsNegative(b);\
+	((presult)->lo = (a).lo - (b).lo);\
+	((presult)->hi = (a).hi - (b).hi);\
+	if (t>(presult)->lo) (presult)->hi--;\
+	*poverflow = ((signa == signb) && !(signa == XSyncValueIsNegative(*presult)));\
+     }
+#define _XSyncMaxValue(pv) ((pv)->hi = 0x7fffffff, (pv)->lo = 0xffffffff)
+#define _XSyncMinValue(pv) ((pv)->hi = 0x80000000, (pv)->lo = 0)
+
+/*
+ *  These are the publically usable macros.  If you want the function version
+ *  of one of these, just #undef the macro to uncover the function.
+ *  (This is the same convention that the ANSI C library uses.)
+ */
+
+#define XSyncIntToValue(pv, i) _XSyncIntToValue(pv, i)
+#define XSyncIntsToValue(pv, l, h) _XSyncIntsToValue(pv, l, h)
+#define XSyncValueGreaterThan(a, b) _XSyncValueGreaterThan(a, b)
+#define XSyncValueLessThan(a, b) _XSyncValueLessThan(a, b)
+#define XSyncValueGreaterOrEqual(a, b) _XSyncValueGreaterOrEqual(a, b)
+#define XSyncValueLessOrEqual(a, b) _XSyncValueLessOrEqual(a, b)
+#define XSyncValueEqual(a, b) _XSyncValueEqual(a, b)
+#define XSyncValueIsNegative(v) _XSyncValueIsNegative(v)
+#define XSyncValueIsZero(a) _XSyncValueIsZero(a)
+#define XSyncValueIsPositive(v) _XSyncValueIsPositive(v)
+#define XSyncValueLow32(v) _XSyncValueLow32(v)
+#define XSyncValueHigh32(v) _XSyncValueHigh32(v)
+#define XSyncValueAdd(presult,a,b,poverflow) _XSyncValueAdd(presult,a,b,poverflow)
+#define XSyncValueSubtract(presult,a,b,poverflow) _XSyncValueSubtract(presult,a,b,poverflow)
+#define XSyncMaxValue(pv) _XSyncMaxValue(pv)
+#define XSyncMinValue(pv) _XSyncMinValue(pv)
+
+/*
+ * Constants for the value_type argument of various requests
+ */
+typedef enum {
+    XSyncAbsolute,
+    XSyncRelative
+} XSyncValueType;
+
+/*
+ * Alarm Test types
+ */
+typedef enum {
+    XSyncPositiveTransition,
+    XSyncNegativeTransition,
+    XSyncPositiveComparison,
+    XSyncNegativeComparison
+} XSyncTestType;
+
+/*
+ * Alarm state constants
+ */
+typedef enum {
+    XSyncAlarmActive,
+    XSyncAlarmInactive,
+    XSyncAlarmDestroyed
+} XSyncAlarmState;
+
+
+typedef XID XSyncCounter;
+typedef XID XSyncAlarm;
+typedef struct _XSyncValue {
+    int hi;
+    unsigned int lo;
+} XSyncValue;
+#endif /* _SYNCCONST_H_ */