Fix implicit declaration of functions.
--- configure.orig	2001-12-18 21:48:47.000000000 -0600
+++ configure	2021-08-13 07:02:11.000000000 -0500
@@ -1010,6 +1010,7 @@
 #line 1011 "configure"
 #include "confdefs.h"
 #include <ctype.h>
+#include <stdlib.h>
 #define ISLOWER(c) ('a' <= (c) && (c) <= 'z')
 #define TOUPPER(c) (ISLOWER(c) ? 'A' + ((c) - 'a') : (c))
 #define XOR(e, f) (((e) && !(f)) || (!(e) && (f)))
--- md5.c.orig	2001-04-11 16:03:18.000000000 -0500
+++ md5.c	2021-08-13 07:13:18.000000000 -0500
@@ -20,6 +20,7 @@
 
 /* Written by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 1995.  */
 
+#include <string.h>
 #include <sys/types.h>
 
 #if 0				/* Get rid of implicit bcopy declaration