https://gitlab.xiph.org/xiph/vorbis-tools/-/merge_requests/6

From ec3a1a1de87168f575b93bc9cedcfaeb82c048a4 Mon Sep 17 00:00:00 2001
From: Florian Weimer <fweimer@redhat.com>
Date: Tue, 7 Feb 2023 08:48:05 +0100
Subject: [PATCH] Fix C99 compatibility glitch in ogginfo/codec_skeleton.c

Include "utf8.h" for a prototype of the utf8_decode function.
This avoids an implicit function declaration and build issues
with future compilers.
--- a/ogginfo/codec_skeleton.c
+++ b/ogginfo/codec_skeleton.c
@@ -25,6 +25,7 @@
 #include <ogg/ogg.h>
 
 #include "i18n.h"
+#include "utf8.h"
 
 #include "private.h"
 
-- 
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