From 7a772ce09dcbbf5767ec9a70411914a5cd3c6cb8 Mon Sep 17 00:00:00 2001
From: Matthew Flatt <mflatt@racket-lang.org>
Date: Thu, 13 Sep 2012 10:50:45 -0600
Subject: [PATCH] fix Win64 build for newer SDK

---
 src/racket/src/jitstack.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/racket/src/jitstack.c b/src/racket/src/jitstack.c
index 00c5586c03..4cae169c1a 100644
--- a/src/racket/src/jitstack.c
+++ b/src/racket/src/jitstack.c
@@ -126,9 +126,11 @@ uintptr_t scheme_approx_sp()
 }
 
 #ifdef _WIN64
+# ifndef UNWIND_HISTORY_TABLE_SIZE
 extern PRUNTIME_FUNCTION WINAPI RtlLookupFunctionEntry(ULONG64, ULONG64*, void*);
 extern PVOID WINAPI RtlVirtualUnwind(DWORD, DWORD64, DWORD64, PRUNTIME_FUNCTION,
 				     PCONTEXT, PVOID, PDWORD64, PVOID);
+# endif
 #endif
 
 static void set_cache(void *p, Scheme_Object *last)