diff -ruN xboing.orig/include/file.h xboing/include/file.h
--- xboing.orig/include/file.h	1996-11-22 02:28:34.000000000 +0100
+++ xboing/include/file.h	2023-04-08 20:27:45.157804561 +0200
@@ -52,6 +52,7 @@
 
 #include <stdio.h>
 #include <time.h>
+#include <sys/types.h>
 
 /*
  *  Constants and macros: