Index: libcfa/src/concurrency/io/setup.cfa
===================================================================
--- libcfa/src/concurrency/io/setup.cfa	(revision d5006b16f3744c6f370101699264624ab0fb946e)
+++ libcfa/src/concurrency/io/setup.cfa	(revision f815c464a8afd853c286022287e629eef41dcc10)
@@ -30,4 +30,8 @@
 	void  ?{}($io_context & this, struct cluster & cl) {}
 	void ^?{}($io_context & this) {}
+
+	void __cfa_io_start( processor * proc ) {}
+	void __cfa_io_flush( processor * proc ) {}
+	void __cfa_io_stop ( processor * proc ) {}
 
 	$io_arbiter * create(void) { return 0p; }