Index: kernel/generic/include/ipc/ipc.h
===================================================================
--- kernel/generic/include/ipc/ipc.h	(revision 7c0e1f596a64720b6f6a6ec66b3499a9d26511cb)
+++ kernel/generic/include/ipc/ipc.h	(revision 503ffceaab0f4c54907677d3399c3ed1363e507f)
@@ -106,4 +106,6 @@
 	/** Phone which made or last masqueraded this call. */
 	phone_t *phone;
+	/** Flags */
+	unsigned flags;
 	/** User-defined label */
 	sysarg_t label;