From a5bbe0d0bee14b4ed53f26c0d01a62286196a92b Mon Sep 17 00:00:00 2001
From: jmole <jmoeller@gmail.com>
Date: Mon, 20 Dec 2021 01:41:30 -0800
Subject: [PATCH] Suggest installing graphviz before book building (#4565)

---
 polkadot/roadmap/implementers-guide/README.md | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/polkadot/roadmap/implementers-guide/README.md b/polkadot/roadmap/implementers-guide/README.md
index 4f68ae02a5e..70a10a26a76 100644
--- a/polkadot/roadmap/implementers-guide/README.md
+++ b/polkadot/roadmap/implementers-guide/README.md
@@ -3,6 +3,14 @@
 The implementers' guide is compiled from several source files with [`mdBook`](https://github.com/rust-lang/mdBook).
 To view it live, locally, from the repo root:
 
+Ensure graphviz is installed:
+```sh
+brew install graphviz # for macOS
+sudo apt-get install graphviz # for Ubuntu/Debian
+```
+
+Then install and build the book:
+
 ```sh
 cargo install mdbook mdbook-linkcheck mdbook-graphviz
 mdbook serve roadmap/implementers-guide
-- 
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