--- session.c.orig	2009-07-09 11:17:42.000000000 -0400
+++ session.c	2009-07-09 11:17:48.000000000 -0400
@@ -40,7 +40,7 @@
 #define	ASYNC_MODE	FNDELAY
 #elif	O_ASYNC
 #define	ASYNC_MODE	O_ASYNC
-#elif
+#else
 #error the fcntl argument to turn ON/OFF non-blocking I/O is unknown
 #endif