diff -ur trafshow-5.2.3.orig/session.c trafshow-5.2.3/session.c
--- trafshow-5.2.3.orig/session.c	2006-01-08 07:58:08.000000000 +0200
+++ trafshow-5.2.3/session.c	2009-07-25 23:54:32.000000000 +0300
@@ -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