diff -Naur a/scaffold.c b/scaffold.c
--- a/scaffold.c	1997-03-21 12:27:24.000000000 -0600
+++ b/scaffold.c	2018-05-27 07:19:17.211524884 -0500
@@ -25,8 +25,6 @@
 #define	INADDR_NONE	(-1)		/* XXX should be 0xffffffff */
 #endif
 
-extern char *malloc();
-
 /* Application-specific. */
 
 #include "tcpd.h"