diff -ur v5.0_original/ncompress-5.0/compress.c v5.0/ncompress-5.0/compress.c
--- v5.0_original/ncompress-5.0/compress.c	2021-02-02 09:16:16.000000000 +0100
+++ v5.0/ncompress-5.0/compress.c	2022-06-24 11:11:52.435388146 +0200
@@ -150,6 +150,7 @@
 #include	<sys/types.h>
 #include	<sys/stat.h>
 #include	<errno.h>
+#include	<unistd.h>
 
 #if !defined(DOS) && !defined(WINDOWS)
 #	include	<dirent.h>
@@ -424,8 +425,8 @@
 char			*ofname = NULL;		/* Output filename								*/
 int				fgnd_flag = 0;		/* Running in background (SIGINT=SIGIGN)		*/
 
-long 			bytes_in;			/* Total number of byte from input				*/
-long 			bytes_out;			/* Total number of byte to output				*/
+long long 			bytes_in;		/* Total number of byte from input				*/
+long long 			bytes_out;		/* Total number of byte to output				*/
 
 /*
  * 8086 & 80286 Has a problem with array bigger than 64K so fake the array