From b657712094425433e98334527dc5dcea649b9fa9 Mon Sep 17 00:00:00 2001
From: Jonathan Ringer <jonringer117@gmail.com>
Date: Wed, 24 Mar 2021 10:20:43 -0700
Subject: [PATCH] python3{6,7}.importlib-metadata: fix build

---
 .../python-modules/importlib-metadata/default.nix         | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/pkgs/development/python-modules/importlib-metadata/default.nix b/pkgs/development/python-modules/importlib-metadata/default.nix
index 95f1ccc0bfc5..4149de3f43ae 100644
--- a/pkgs/development/python-modules/importlib-metadata/default.nix
+++ b/pkgs/development/python-modules/importlib-metadata/default.nix
@@ -3,6 +3,7 @@
 , fetchPypi
 , pythonOlder
 , setuptools-scm
+, typing-extensions
 , toml
 , zipp
 }:
@@ -20,7 +21,12 @@ buildPythonPackage rec {
 
   nativeBuildInputs = [ setuptools-scm ];
 
-  propagatedBuildInputs = [ toml zipp ];
+  propagatedBuildInputs = [
+    toml
+    zipp
+  ] ++ lib.optionals (pythonOlder "3.8") [
+    typing-extensions
+  ];
 
   # Cyclic dependencies due to pyflakefs
   doCheck = false;