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