+/* On OS X 10.5, the field names for the thread state have changed and
+ * now are prepended with __. Use some #define hackery to deal with
+ * this.
+ */
+#if __DARWIN_UNIX03
+
+#define PPC_DARWIN_REGIFY(foo) __ ## foo
+
+typedef ppc_thread_state_t ppc_ss_struct_t;
+
+#else
+
+#define PPC_DARWIN_REGIFY(foo) foo
+
+typedef ppc_saved_state_t ppc_ss_struct_t;