https://git.ruby-lang.org/ruby.git/commit/?id=d806078237

From d8060782373c181bc689ce9bc73f6cb8b74de44d Mon Sep 17 00:00:00 2001
From: Kazuhiro NISHIYAMA <zn@m...>
Date: Tue, 27 Aug 2019 18:46:16 +0900
Subject: Add graphviz for dot command


diff --git a/.github/workflows/doxygen.yml b/.github/workflows/doxygen.yml
index 54a09c3..0459968 100644
--- a/.github/workflows/doxygen.yml
+++ b/.github/workflows/doxygen.yml
@@ -18,7 +18,7 @@ jobs: https://github.com/ruby/ruby/blob/trunk/.github/workflows/doxygen.yml#L18
           set -x
           sudo sed /etc/apt/sources.list -e "s/^# deb-src/deb-src/g" -i
           sudo apt-get update
-          sudo apt-get install ruby2.5 doxygen
+          sudo apt-get install ruby2.5 doxygen graphviz
           sudo apt-get build-dep ruby2.5
 
       # Not using official actions/checkout because it's unstable and sometimes doesn't work for a fork.
-- 
cgit v0.10.2


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