+#ifdef LISP_FEATURE_PPC
+ /* On PPC when consing wants to turn to alloc(), it does so via a
+ * trap. When alloc() wants to save the sigmask it consults
+ * allocation_trap_context. It does not look up the most recent
+ * context, because alloc() can be called from other places
+ * too. */
+ os_context_t *allocation_trap_context;
+#endif