--- Gnu-Mach/device/if_ether.h	2020/09/02 04:36:57	1.1.1.1
+++ Gnu-Mach/device/if_ether.h	2020/09/02 04:45:33	1.1.1.3
@@ -2,7 +2,7 @@
  * Mach Operating System
  * Copyright (c) 1991 Carnegie Mellon University
  * All Rights Reserved.
- * 
+ *
  * Permission to use, copy, modify and distribute this software and its
  * documentation is hereby granted, provided that both the copyright
  * notice and this permission notice appear in all copies of the
@@ -51,7 +51,7 @@ struct	ether_header {
 #ifdef	KERNEL
 u_char	etherbroadcastaddr[6];
 
-extern char *	ether_sprintf();
-#endif	KERNEL
+extern char *	ether_sprintf(u_char *);
+#endif	/* KERNEL */
 
 #endif	/*_DEVICE_IF_ETHER_H_*/