fixing a build failure of mandoc-portable on Arch Linux
reported by Stephen Gregoratto <dev at sgregoratto dot me>.
-/* $Id: tag.c,v 1.31 2020/04/02 22:12:55 schwarze Exp $ */
+/* $Id: tag.c,v 1.32 2020/04/03 10:30:09 schwarze Exp $ */
/*
* Copyright (c) 2015,2016,2018,2019,2020 Ingo Schwarze <schwarze@openbsd.org>
*
#include <assert.h>
#include <limits.h>
#include <stddef.h>
+#include <stdint.h>
#include <stdlib.h>
#include <string.h>