From d0e254420445c2204a2b39d28948cd6127717fb1 2023-12-27 16:20:45
From: Matthias Bussonnier <bussonniermatthias@gmail.com>
Date: 2023-12-27 16:20:45
Subject: [PATCH] Fix diagrams by reinstating graphiz (#14272)

copying https://github.com/jupyter/jupyter/pull/714

resolves part of #14213

Check my work! I haven't worked with readthedocs myself, I'm just
blindly copying what worked for Jupyter.
---

diff --git a/.readthedocs.yaml b/.readthedocs.yaml
index 643b40b..426a817 100644
--- a/.readthedocs.yaml
+++ b/.readthedocs.yaml
@@ -4,6 +4,8 @@ build:
   os: ubuntu-22.04
   tools:
     python: "3.11"
+  apt_packages:
+    - graphviz
 
 sphinx:
   configuration: docs/source/conf.py