--- src/tape.c	2012-12-22 07:53:19.000000000 +0000
+++ src/tape.c	2022-09-06 20:58:23.694178693 +0100
@@ -23,6 +23,9 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <ctype.h>
+#include <unistd.h>
+#include <sys/types.h>
 
 #include "z80.h"
 #include "tape.h"