--- main.c.orig	2021-11-20 13:13:34 UTC
+++ main.c
@@ -1,6 +1,5 @@
 #include "vt100.h"
 #include "xsdl.h"
-#define _XOPEN_SOURCE 600
 #include <stdlib.h>
 #include <unistd.h>
 #include <fcntl.h>