From 9ce2f75ff4063683bfd3f99a2aa4a88e824cfa1e Mon Sep 17 00:00:00 2001
From: Bernardo Meurer <bernardo@meurer.org>
Date: Thu, 18 Nov 2021 13:10:03 -0800
Subject: [PATCH] fix(overrides): add flit-core to typing-extensions

---
 overrides.nix | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/overrides.nix b/overrides.nix
index b45f6d1..a97475c 100644
--- a/overrides.nix
+++ b/overrides.nix
@@ -1812,7 +1812,12 @@ self: super:
   });
 
   # nix uses a dash, poetry uses an underscore
-  typing_extensions = super.typing_extensions or self.typing-extensions;
+  typing-extensions = (super.typing_extensions or super.typing-extensions).overridePythonAttrs (
+    old: {
+      buildInputs = (old.buildInputs or [ ]) ++
+        lib.optional (lib.versionAtLeast old.version "4.0.0") [ self.flit-core ];
+    }
+  );
 
   urwidtrees = super.urwidtrees.overridePythonAttrs (
     old: {