Index: libcfa/src/bits/defs.hfa
===================================================================
--- libcfa/src/bits/defs.hfa	(revision d0502a3aee721f5f4e468913c7db6c2aab56025c)
+++ libcfa/src/bits/defs.hfa	(revision f815c464a8afd853c286022287e629eef41dcc10)
@@ -74,2 +74,4 @@
 	#error unsupported architecture
 #endif
+
+#define CFA_IO_LAZY (1_l64u << 32_l64u)