From 3661a255938232d3517690452f0f4e5ff794d9a7 Mon Sep 17 00:00:00 2001
From: Jörg Thalheim <joerg@thalheim.io>
Date: Fri, 23 Jul 2021 08:02:40 +0200
Subject: python3Packages.gym: fix build

Tested by running one of their code examples

(cherry picked from commit 13cef561850fc6ee01de09f945c0e6047c26ef3c)
---
 pkgs/development/python-modules/gym/default.nix | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/pkgs/development/python-modules/gym/default.nix b/pkgs/development/python-modules/gym/default.nix
index a1cd76cd38e4..08f248acd302 100644
--- a/pkgs/development/python-modules/gym/default.nix
+++ b/pkgs/development/python-modules/gym/default.nix
@@ -29,6 +29,11 @@ buildPythonPackage rec {
     scipy
   ];
 
+  postPatch = ''
+    substituteInPlace setup.py \
+      --replace "Pillow<=8.2.0" "Pillow"
+  '';
+
   # The test needs MuJoCo that is not free library.
   doCheck = false;
 
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