--- lex.tokenizer_yy.c.orig	2011-12-04 00:26:18.936001023 +0100
+++ lex.tokenizer_yy.c	2011-12-04 00:26:34.083001026 +0100
@@ -39,6 +39,7 @@
 #include <string.h>
 #include <errno.h>
 #include <stdlib.h>
+#include <unistd.h>
 
 /* end standard C headers. */