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