{
  nixpkgs,
  system,
  geoip2-tarball,
}: let
  pkgs = import nixpkgs {
    inherit system;
    overlays = [
      (_: super: {
        python3 = super.python3.override {
          packageOverrides = _: python-super: {
            django = python-super.django_5;
          };
        };
        geoip-mmdb = pkgs.callPackage ./pkgs/geoip-mmdb.nix {
          inherit geoip2-tarball;
        };
        e11sync-static = pkgs.callPackage ./pkgs/e11sync-static.nix {};
        e11sync-frontend = pkgs.callPackage ./pkgs/e11sync-frontend.nix {};
        e11sync-backend = pkgs.callPackage ./pkgs/e11sync-backend.nix {};
      })
    ];
  };
in
  pkgs