diff --git a/reactos/include/ddk/rtl.h b/reactos/include/ddk/rtl.h
index d8ae5c4cceb..ef57a1ceff3 100644
--- a/reactos/include/ddk/rtl.h
+++ b/reactos/include/ddk/rtl.h
@@ -1,4 +1,4 @@
-/* $Id: rtl.h,v 1.20 1999/12/01 15:17:12 ekohl Exp $
+/* $Id: rtl.h,v 1.21 1999/12/18 10:15:11 ea Exp $
  * 
  */
 
@@ -797,10 +797,17 @@ RtlMultiByteToUnicodeSize (
 	);
 
 DWORD
+STDCALL
 RtlNtStatusToDosError (
 	NTSTATUS	StatusCode
 	);
 
+int
+STDCALL
+RtlNtStatusToPsxErrno (
+	NTSTATUS	StatusCode
+	);
+
 ULONG
 STDCALL
 RtlOemStringToUnicodeSize (
diff --git a/reactos/include/ddk/zwtypes.h b/reactos/include/ddk/zwtypes.h
index 6fa911dec72..7358b050dda 100644
--- a/reactos/include/ddk/zwtypes.h
+++ b/reactos/include/ddk/zwtypes.h
@@ -132,6 +132,7 @@ typedef struct _LPCMESSAGE
 
 #define SystemPerformanceInformation		5
 #define SystemDriverInformation			11
+#define SystemIdentityInformation		12
 #define SystemCacheInformation			21
 #define SystemTimeAdjustmentInformation		28
 #define SystemTimeZoneInformation		44