the main bustage was ds requiring io which it can't do, so we'll try to forward declare it instead.

cross your fingers.

xpcom/ds/nsIPersistentProperties2.idl

@@ -37,10 +37,11 @@
 
 #include "nsISupports.idl"
 #include "nsIProperties.idl"
-#include "nsIInputStream.idl"
-#include "nsIOutputStream.idl"
 #include "nsISimpleEnumerator.idl"
 
+interface nsIInputStream;
+interface nsIOutputStream;
+
 [scriptable, uuid(283EE646-1AEF-11D4-98B3-00C04fA0CE9A)]
 interface nsIPropertyElement : nsISupports {
   attribute AUTF8String key;