{

  description = "git static site generator";

  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-22.11";

  outputs = inputs: let
    forAllSystems = function:
      inputs.nixpkgs.lib.genAttrs [
        "x86_64-linux"
        "aarch64-linux"
        "aarch64-darwin"
      ] (system: function (import inputs.nixpkgs {
        system   = system;
        overlays = [ inputs.self.overlays.default ];
      }));

  in {

    packages = forAllSystems (pkgs: {
      default = pkgs.stagit;
      stagit  = pkgs.stagit;
    });

    apps = forAllSystems (pkgs: {
      default.type    = "app";
      default.program = "${pkgs.stagit}/bin/stagit";
    });

    overlays.default = final: prev: {
      stagit = final.stdenv.mkDerivation rec {
        name = "stagit";
        src  = inputs.self;

        makeFlags = [ "PREFIX=$(out)" ];

        buildInputs = [ final.libgit2 final.md4c ];
      };
    };

  };

}