--- p11-kit/compat.h.orig	2011-11-16 00:22:54.470657049 +0100
+++ p11-kit/compat.h	2011-11-16 00:26:49.970789701 +0100
@@ -43,8 +43,14 @@
 
 #ifdef OS_WIN32
 
+#ifndef _WIN32_WINNT
 #define _WIN32_WINNT 0x500
-#define _WIN32_IE 0x400
+#endif
+
+#ifndef _WIN32_IE
+#define _WIN32_IE 0x500
+#endif
+
 #define WIN32_LEAN_AND_MEAN 1
 #include <windows.h>