diff -Naur teapot-2.3.0-old/scanner.c teapot-2.3.0-new/scanner.c
--- teapot-2.3.0-old/scanner.c	1969-12-31 21:00:01.000000000 -0300
+++ teapot-2.3.0-new/scanner.c	2021-11-25 17:46:49.936673391 -0300
@@ -25,6 +25,7 @@
 #include "main.h"
 #include "misc.h"
 #include "scanner.h"
+#include "utf8.h"
 /*}}}*/
 
 /* identcode  -- return number of identifier */ /*{{{*/