Index: libcfa/src/concurrency/io/setup.cfa
===================================================================
--- libcfa/src/concurrency/io/setup.cfa	(revision 12b5e94a9df5bfc0037b0fe7eb823f658a9b0d9d)
+++ libcfa/src/concurrency/io/setup.cfa	(revision 6a823241f523e2ed232755b1a5401712de96e95c)
@@ -32,5 +32,5 @@
 
 	void __cfa_io_start( processor * proc ) {}
-	bool __cfa_io_flush( processor * proc, int ) {}
+	bool __cfa_io_flush( processor * proc, int ) { return false; }
 	void __cfa_io_stop ( processor * proc ) {}