{
  sources ? import ./npins,
  pkgs ? import sources.nixpkgs { },
}:

let
  nix-pkgs = import sources.nix-pkgs { inherit pkgs; };
  kat-pkgs = import sources.kat-pkgs { inherit pkgs; };

  python3 = pkgs.python3.override {
    packageOverrides = final: prev: {
      inherit (nix-pkgs)
        authens
        django-bootstrap-form
        django-cas-ng
        loadcredential
        ;

      inherit (kat-pkgs.python3Packages)
        django-djconfig
        django-hCaptcha
        wagtail-modeltranslation
        wagtailmenus
        ;
    };
  };
in
pkgs.mkShell {
  shellHook = ''
    if [ ! -d .static ]; then
      mkdir .static
    fi
  '';

  env = {
    CREDENTIALS_DIRECTORY = builtins.toString ./.credentials;
    DJANGO_SETTINGS_MODULE = "gestioasso.settings.local";

    GESTIOCOF_DEBUG = true;
    GESTIOCOF_STATIC_ROOT = builtins.toString ./.static;

    GESTIOBDS_DEBUG = true;
    GESTIOBDS_STATIC_ROOT = builtins.toString ./.static;
  };

  packages = [
    (python3.withPackages (
      ps: with ps; [
        django
        pillow
        authens
        channels
        configparser
        django-autocomplete-light
        django-bootstrap-form
        django-cas-ng
        django-cors-headers
        django-djconfig
        django-hCaptcha
        django-js-reverse
        django-widget-tweaks
        icalendar
        loadcredential
        python-dateutil
        statistics
        wagtail-modeltranslation
        wagtail
        wagtailmenus

        django-debug-toolbar
        ipython
        black
        flake8
        isort

        daphne
      ]
    ))
    pkgs.npins
  ];

  allowSubstitutes = false;
}