{
  description = "A game stub written in Haskell";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs";
    flake-utils.url = "github:numtide/flake-utils";
    mateamt-src = {
      url = "git+https://gitea.nek0.eu/nek0/mateamt";
      inputs = {
        nixpkgs.follows = "nixpkgs";
        flake-utils.follows = "flake-utils";
      };
    };
  };

  outputs = { self, nixpkgs, flake-utils, mateamt-src }:
    flake-utils.lib.eachDefaultSystem (system:
      let
        pkgs = nixpkgs.legacyPackages.${system};

        haskellPackages = pkgs.haskellPackages.override {
          overrides = hself: hsuper: {
            i18n = with pkgs.haskell.lib;
              doJailbreak (unmarkBroken (dontCheck hsuper.i18n));
          };
        };

        jailbreakUnbreak = pkg:
          pkgs.haskell.lib.doJailbreak (pkg.overrideAttrs (_: { meta = { }; }));

        packageName = "matebeamter";
      in {
        packages.${packageName} = # (ref:haskell-package-def)
          haskellPackages.callCabal2nix packageName self rec {
            mateamt = mateamt-src.defaultPackage.${system};
          };

        defaultPackage = self.packages.${system}.${packageName};

        devShell = pkgs.mkShell {
          buildInputs = with haskellPackages; [
            haskell-language-server
            ghcid
            cabal-install
          ];
          inputsFrom = builtins.attrValues self.packages.${system};
        };
      });
}