Index: implement.h
===================================================================
--- implement.h    (revision 19389)
+++ implement.h    (revision 19390)
@@ -667,8 +667,12 @@
  * See ptw32_InterlockedCompareExchange.c
  */
 #ifndef PTW32_INTERLOCKED_COMPARE_EXCHANGE
+#ifdef _WIN64
+#define PTW32_INTERLOCKED_COMPARE_EXCHANGE _InterlockedCompareExchange
+#else
 #define PTW32_INTERLOCKED_COMPARE_EXCHANGE 
ptw32_interlocked_compare_exchange
 #endif
+#endif
 
 #ifndef PTW32_INTERLOCKED_EXCHANGE
 #define PTW32_INTERLOCKED_EXCHANGE InterlockedExchange

Index: ptw32_InterlockedCompareExchange.c
===================================================================
--- ptw32_InterlockedCompareExchange.c    (revision 19389)
+++ ptw32_InterlockedCompareExchange.c    (revision 19390)
@@ -34,6 +34,7 @@
  *      if not, write to the Free Software Foundation, Inc.,
  *      59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
  */
+#ifndef _WIN64
 
 #include "pthread.h"
 #include "implement.h"
@@ -301,3 +302,5 @@
 #endif
 
 #endif
+
+#endif

Index: pthread_win32_attach_detach_np.c
===================================================================
--- pthread_win32_attach_detach_np.c    (revision 19389)
+++ pthread_win32_attach_detach_np.c    (revision 19390)
@@ -91,6 +91,14 @@
 
 #endif
 
+#ifdef _WIN64
+/*
+ * InterlockedCompareExchange routine in WIN64 is an intrinsic function.
+ * See PTW32_INTERLOCKED_COMPARE_EXCHANGE implement.h
+ */
+
+#else
+
 #ifdef WINCE
 
   /*
@@ -143,6 +151,7 @@
     {
       ptw32_features |= PTW32_SYSTEM_INTERLOCKED_COMPARE_EXCHANGE;
     }
+#endif
 
   /*
    * Load QUSEREX.DLL and try to get address of QueueUserAPCEx