From 28f350e320c6a4b3b7939d7b7f030806bb607023 Mon Sep 17 00:00:00 2001
From: Yuki Okushi <huyuumi.dev@gmail.com>
Date: Sun, 18 Oct 2020 02:30:08 +0900
Subject: [PATCH] Set `MDBOOK_OUTPUT__HTML__INPUT_404` on linkchecker

---
 src/tools/linkchecker/linkcheck.sh | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/tools/linkchecker/linkcheck.sh b/src/tools/linkchecker/linkcheck.sh
index bbccc17e494..b68053c76be 100755
--- a/src/tools/linkchecker/linkcheck.sh
+++ b/src/tools/linkchecker/linkcheck.sh
@@ -34,6 +34,9 @@ then
     exit 1
 fi
 
+# Avoid failure caused by newer mdbook.
+export MDBOOK_OUTPUT__HTML__INPUT_404=""
+
 book_name=""
 # Iterative will avoid cleaning up, so you can quickly run it repeatedly.
 iterative=0