default.nix

@@ -1,5 +1,4 @@
-{ pkgs, lib ? pkgs.lib }: with lib;
-mapAttrs' (name: _: {
-  value = pkgs.python3.pkgs.callPackage (./python-pkgs/${name}) { };
-  name = removeSuffix ".nix" name;
-}) (builtins.readDir ./python-pkgs)
+{
+  pkgs ? (import <nixpkgs> { }),
+}:
+import pkgs.path { overlays = pkgs.overlays ++ [ (import ./overlay.nix) ]; }

overlay.nix

@@ -0,0 +1,5 @@
+self: super: with super.lib;
+mapAttrs' (name: _: {
+  value = self.python3.pkgs.callPackage (./python-pkgs/${name}) { };
+  name = removeSuffix ".nix" name;
+}) (builtins.readDir ./python-pkgs)

python-pkgs/django-impersonate.nix

@@ -23,7 +23,7 @@ buildPythonPackage rec {
     wheel
   ];
 
-  # pythonImportsCheck = [ "django_impersonate" ];
+  pythonImportsCheck = [ "impersonate" ];
 
   meta = {
     description = "Fork of https://bitbucket.org/petersanchez/django-impersonate";