From 13cef561850fc6ee01de09f945c0e6047c26ef3c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=B6rg=20Thalheim?= <joerg@thalheim.io>
Date: Fri, 23 Jul 2021 08:02:40 +0200
Subject: [PATCH] python3Packages.gym: fix build

Tested by running one of their code examples
---
 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 888dbf45342e..1bda1d8ac2d2 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;