Fix implicit declaration of functions.
--- rx/configure.orig	1996-09-18 12:33:36.000000000 -0500
+++ rx/configure	2021-03-04 12:39:41.000000000 -0600
@@ -969,6 +969,7 @@
 #line 970 "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)))
--- rx/rx.c.orig	1997-01-15 14:08:03.000000000 -0600
+++ rx/rx.c	2021-03-04 12:52:22.000000000 -0600
@@ -18,6 +18,7 @@
 
 
 
+#include <stdlib.h>
 #include "rx.h"
 #include "rxall.h"
 #include "rxhash.h"
--- rx/rxanal.c.orig	1996-12-02 23:33:15.000000000 -0600
+++ rx/rxanal.c	2021-03-04 12:51:36.000000000 -0600
@@ -18,6 +18,7 @@
 
 
 
+#include <stdlib.h>
 #include "rxall.h"
 #include "rxanal.h"
 #include "rxbitset.h"
--- rx/rxbasic.c.orig	1996-11-08 11:04:12.000000000 -0600
+++ rx/rxbasic.c	2021-03-04 12:49:50.000000000 -0600
@@ -18,6 +18,7 @@
 
 
 
+#include <stdlib.h>
 #include "rxall.h"
 #include "rxbasic.h"
 #include "rxstr.h"
--- rx/rxbitset.c.orig	1996-09-18 12:12:27.000000000 -0500
+++ rx/rxbitset.c	2021-03-04 12:51:51.000000000 -0600
@@ -22,6 +22,7 @@
  */
 
 
+#include "rx.h"
 #include "rxall.h"
 #include "rxbitset.h"
 
--- rx/rxcset.c.orig	1996-09-18 12:12:27.000000000 -0500
+++ rx/rxcset.c	2021-03-04 12:46:05.000000000 -0600
@@ -23,6 +23,7 @@
 
 
 
+#include <stdlib.h>
 #include "rxall.h"
 #include "rxcset.h"
 /* Utilities for manipulating bitset represntations of characters sets. */
--- rx/rxdbug.c.orig	1996-12-02 23:33:15.000000000 -0600
+++ rx/rxdbug.c	2021-03-04 12:45:43.000000000 -0600
@@ -18,6 +18,7 @@
 
 
 
+#include <ctype.h>
 #include <stdio.h>
 #include "rxall.h"
 #include "rxgnucomp.h"
--- rx/rxgnucomp.c.orig	1997-01-13 12:07:36.000000000 -0600
+++ rx/rxgnucomp.c	2021-03-04 12:45:08.000000000 -0600
@@ -17,7 +17,12 @@
  */
 
 
+#include <ctype.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
 #include <sys/types.h>
+#include "rx.h"
 #include "rxall.h"
 #include "rxgnucomp.h"
 #include "inst-rxposix.h"
--- rx/rxhash.c.orig	1996-09-18 12:12:27.000000000 -0500
+++ rx/rxhash.c	2021-03-04 12:49:26.000000000 -0600
@@ -22,6 +22,8 @@
  */
 
 
+#include <stdlib.h>
+#include "rx.h"
 #include "rxall.h"
 #include "rxhash.h"
 
--- rx/rxnfa.c.orig	1996-11-22 05:33:29.000000000 -0600
+++ rx/rxnfa.c	2021-03-04 12:47:39.000000000 -0600
@@ -22,6 +22,8 @@
  */
 
 
+#include <stdlib.h>
+#include "rx.h"
 #include "rxall.h"
 #include "rxnfa.h"
 
--- rx/rxnode.c.orig	1997-01-15 13:47:48.000000000 -0600
+++ rx/rxnode.c	2021-03-04 12:48:41.000000000 -0600
@@ -20,6 +20,9 @@
 
 
 
+#include <stdlib.h>
+#include <string.h>
+#include "rx.h"
 #include "rxall.h"
 #include "rxnode.h"
 
--- rx/rxposix.c.orig	1996-12-03 12:29:55.000000000 -0600
+++ rx/rxposix.c	2021-03-04 12:49:01.000000000 -0600
@@ -18,6 +18,10 @@
 
 
 
+#include <ctype.h>
+#include <stdlib.h>
+#include <string.h>
+#include "rx.h"
 #include "rxall.h"
 #include "rxposix.h"
 #include "rxgnucomp.h"
--- rx/rxsimp.c.orig	1996-09-18 12:12:28.000000000 -0500
+++ rx/rxsimp.c	2021-03-04 12:52:06.000000000 -0600
@@ -18,6 +18,7 @@
 
 
 
+#include <ctype.h>
 #include "rxall.h"
 #include "rxsimp.h"
 
--- rx/rxspencer.c.orig	1996-12-03 02:34:48.000000000 -0600
+++ rx/rxspencer.c	2021-03-04 12:53:17.000000000 -0600
@@ -19,6 +19,8 @@
 
 
 #include <stdio.h>
+#include <stdlib.h>
+#include "rx.h"
 #include "rxall.h"
 #include "rxspencer.h"
 #include "rxsimp.h"
--- rx/rxstr.c.orig	1996-11-23 00:23:13.000000000 -0600
+++ rx/rxstr.c	2021-03-04 12:50:50.000000000 -0600
@@ -18,6 +18,8 @@
 
 
 
+#include <string.h>
+#include <strings.h>
 #include "rxall.h"
 #include "rxstr.h"
 
--- rx/rxsuper.c.orig	1997-01-15 13:25:06.000000000 -0600
+++ rx/rxsuper.c	2021-03-04 12:53:33.000000000 -0600
@@ -20,6 +20,8 @@
 
 
 
+#include <stdlib.h>
+#include "rx.h"
 #include "rxall.h"
 #include "rxsuper.h"
 
--- rx/rxsuper.h.orig	1996-11-08 11:03:50.000000000 -0600
+++ rx/rxsuper.h	2021-03-04 13:00:26.000000000 -0600
@@ -421,6 +421,8 @@
 
 
 #ifdef __STDC__
+extern void rx_refresh_this_superstate (struct rx_cache * cache,
+					struct rx_superstate * superstate);
 extern char * rx_cache_malloc (struct rx_cache * cache, int size);
 extern void rx_cache_free (struct rx_cache * cache, int size, char * mem);
 extern void rx_release_superset (struct rx *rx,
@@ -433,6 +435,7 @@
 extern struct rx_inx * rx_handle_cache_miss (struct rx *rx, struct rx_superstate *super, unsigned char chr, void *data) ;
 
 #else /* STDC */
+extern void rx_refresh_this_superstate ();
 extern char * rx_cache_malloc ();
 extern void rx_cache_free ();
 extern void rx_release_superset ();
--- rx/rxunfa.c.orig	1996-11-24 05:54:27.000000000 -0600
+++ rx/rxunfa.c	2021-03-04 12:52:38.000000000 -0600
@@ -20,6 +20,7 @@
 
 
 
+#include <stdlib.h>
 #include "rxall.h"
 #include "rx.h"
 #include "rxunfa.h"