{
  description = "A flake to use Chicken 6 with TinyCC.";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
  };

  outputs = inputs @ {
    self,
      nixpkgs,
      systems,
      ...
  }: let
    inherit (nixpkgs) lib;
    forAllSystems = lib.genAttrs [
      "aarch64-linux"
      "i686-linux"
      "x86_64-linux"
      "aarch64-darwin"
      "x86_64-darwin"
    ];
    pkgsFor = forAllSystems (system:
      import nixpkgs {
        localSystem.system = system;
        overlays = with self.overlays; [chicken];
      });
    mkDate = longDate: (lib.concatStringsSep "-" [
      (builtins.substring 0 4 longDate)
      (builtins.substring 4 2 longDate)
      (builtins.substring 6 2 longDate)
    ]);
    version = "6.0.0";
  in {
    overlays = {
      default = self.overlays.chicken;

      chicken = final: prev: {
        # tcc-mob = final.callPackage ./nix/tinycc.nix {
        #   stdenv = final.gcc13Stdenv;
        # };
        chicken = final.callPackage ./nix/chicken.nix {
          stdenv = final.gcc13Stdenv;
          version = version + "+date=" + (mkDate (self.lastModifiedDate or "19700101")) + "_" + (self.shortRev or "dirty");
        };
      };
    };

    devShells = forAllSystems (system: {
      default = let
        pkgs = import nixpkgs {
          overlays = [ self.overlays.chicken ];
        };
      in pkgs.mkShell {
        packages = with pkgs; [ chicken ];
        shellHook = ''
          export CHICKEN_INSTALL_REPOSITORY="$(pwd)/.chicken/eggs"
          export CHICKEN_REPOSITORY_PATH="${pkgs.chicken}/lib/chicken/12:$CHICKEN_REPOSITORY_PATH:$(pwd)/.chicken/eggs"
          export PATH="$PATH:$CHICKEN_INSTALL_PREFIX/bin"
        '';
      };
    });
  };
}