Fix:

implicit declaration of function 'LZXinit' is invalid in C99

implicit declaration of function 'LZXreset' is invalid in C99

implicit declaration of function 'LZXdecompress' is invalid in C99

implicitly declaring library function 'isalnum' with type 'int (int)'

implicitly declaring library function 'memcpy' with type 'void *(void *, const void *, unsigned long)'

implicitly declaring library function 'memset' with type 'void *(void *, int, unsigned long)'

implicit declaration of function 'mkdir' is invalid in C99

implicitly declaring library function 'strcmp' with type 'int (const char *, const char *)'
--- clit/display.c.orig	2004-07-02 07:19:58.000000000 -0500
+++ clit/display.c	2020-10-06 18:09:32.000000000 -0500
@@ -22,6 +22,7 @@
 */
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include "litlib.h"
 
 extern void hexdump( unsigned char * ptr, int size );
--- clit/drm5.c.orig	2004-07-04 16:19:32.000000000 -0500
+++ clit/drm5.c	2020-10-06 18:16:12.000000000 -0500
@@ -26,6 +26,7 @@
  * Note that the July 4th update added only a trivial amount of complexity
  * to this process. 
  */
+#include <ctype.h>
 #include <sys/types.h>
 #include <stdio.h>
 #include <stdlib.h>
--- clit/explode.c.orig	2004-07-04 06:33:52.000000000 -0500
+++ clit/explode.c	2020-10-06 18:11:47.000000000 -0500
@@ -24,6 +24,7 @@
 #include <stdio.h>
 #include <stdlib.h> 
 #include <string.h>
+#include <sys/stat.h>
 #include "clit.h"
 #include "litlib.h"
 #include "manifest.h"
--- clit/hexdump.c.orig	2004-05-14 23:09:14.000000000 -0500
+++ clit/hexdump.c	2010-11-01 17:46:28.000000000 -0500
@@ -16,6 +16,7 @@
 #include <ctype.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 
 typedef unsigned char byte;
 
--- clit/manifest.c.orig	2004-07-04 06:02:56.000000000 -0500
+++ clit/manifest.c	2020-10-06 18:02:23.000000000 -0500
@@ -23,6 +23,7 @@

 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include "litlib.h"
 #include "manifest.h"
 #include "utils.h"
--- clit/transmute.c.orig	2003-07-05 19:40:14.000000000 -0500
+++ clit/transmute.c	2020-10-06 18:01:54.000000000 -0500
@@ -22,6 +22,7 @@
 */
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include "litlib.h"
 
 extern char * writingFilename;
--- lib/newlzx/lzx.h.orig	2004-07-04 09:28:18.000000000 -0500
+++ lib/newlzx/lzx.h	2020-10-06 21:34:05.000000000 -0500
@@ -166,4 +166,9 @@
  */
 void lzxd_free(struct lzxd_stream *lzx);

+int LZXinit(int window);
+void LZXreset(void);
+int LZXdecompress(unsigned char *inbuf, unsigned char *outbuf,
+    unsigned int inlen, unsigned int outlen);
+
 #endif
--- lib/newlzx/lzxglue.c.orig	2004-07-04 09:38:58.000000000 -0500
+++ lib/newlzx/lzxglue.c	2020-10-06 18:13:48.000000000 -0500
@@ -28,6 +28,7 @@
  */
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include "litlib.h"
 #include "mspack.h"
 #include "lzx.h"