diff -Naur teapot-2.3.0/scanner.c teapot-2.3.0.patched/scanner.c
--- teapot-2.3.0/scanner.c	2012-02-06 06:30:53.000000000 -0500
+++ teapot-2.3.0.patched/scanner.c	2020-11-19 00:24:24.289622714 -0500
@@ -25,6 +25,7 @@
 #include "main.h"
 #include "misc.h"
 #include "scanner.h"
+#include "utf8.h"
 /*}}}*/
 
 /* identcode  -- return number of identifier */ /*{{{*/