diff --git a/winsup/cygwin/winbase.h b/winsup/cygwin/winbase.h
deleted file mode 100644
index 1e825e4d4..000000000
--- a/winsup/cygwin/winbase.h
+++ /dev/null
@@ -1,59 +0,0 @@
-/* winbase.h
-
-   Copyright 2001, 2002, 2003, 2004, 2005, 2008, 2009, 2012 Red Hat, Inc.
-
-This software is a copyrighted work licensed under the terms of the
-Cygwin license.  Please consult the file "CYGWIN_LICENSE" for
-details. */
-
-#include_next "winbase.h"
-
-#ifndef _WINBASE2_H
-#define _WINBASE2_H
-
-__attribute__((gnu_inline))
-extern __inline__ LONG
-ilockcmpexch (volatile LONG *t, LONG v, LONG c)
-{
-  return
-  ({
-    register LONG ret __asm ("%eax");
-    __asm __volatile ("lock cmpxchgl %2, %1"
-	: "=a" (ret), "=m" (*t)
-	: "r" (v), "m" (*t), "0" (c)
-	: "memory");
-    ret;
-  });
-}
-
-#undef InterlockedCompareExchange
-#define InterlockedCompareExchange ilockcmpexch
-#undef InterlockedCompareExchangePointer
-
-#ifdef __x86_64__
-__attribute__((gnu_inline))
-extern __inline__ LONGLONG
-ilockcmpexch64 (volatile LONGLONG *t, LONGLONG v, LONGLONG c)
-{
-  return
-  ({
-    register LONGLONG ret __asm ("%rax");
-    __asm __volatile ("lock cmpxchgq %2, %1"
-	: "=a" (ret), "=m" (*t)
-	: "r" (v), "m" (*t), "0" (c)
-	: "memory");
-    ret;
-  });
-}
-
-#define InterlockedCompareExchange64 ilockcmpexch64
-#define InterlockedCompareExchangePointer(d,e,c) \
-    (PVOID)InterlockedCompareExchange64((LONGLONG volatile *)(d),(LONGLONG)(e),(LONGLONG)(c))
-
-#else
-
-#define InterlockedCompareExchangePointer(d,e,c) \
-    (PVOID)InterlockedCompareExchange((LONG volatile *)(d),(LONG)(e),(LONG)(c))
-
-#endif /* !__x86_64 */
-#endif /*_WINBASE2_H*/