(get_real_username): Mark unused arguments.

src/server/rfc931.c

 /*
- * $Id: rfc931.c,v 1.15 1998/07/08 17:01:09 ceder Exp $
+ * $Id: rfc931.c,v 1.16 1998/08/07 23:32:20 ceder Exp $
  * Copyright (C) 1991, 1992, 1993, 1994  Lysator Academic Computer Association.
  *
  * This file is part of the LysKOM server.
@@ -50,10 +50,17 @@
 #include "kom-types.h"
 #include "param.h"
 #include "rfc931.h"
+#include "unused.h"
+
+#ifdef HAVE_LIBAUTHUSER
+#  define USE_IF_LIBAUTHUSER(x) x
+#else
+#  define USE_IF_LIBAUTHUSER(x) UNUSED(x)
+#endif
 
 const char *
-get_real_username(IscSession *scb,
-		  char *hostname)
+get_real_username(IscSession *USE_IF_LIBAUTHUSER(scb),
+		  char       *USE_IF_LIBAUTHUSER(hostname))
 {
 #ifdef HAVE_LIBAUTHUSER
     unsigned long inlocal;