{
  description = "hledger-time";

  inputs = {
    flake-utils = {
      url = "github:numtide/flake-utils";
    };
  };

  outputs = { self, nixpkgs, flake-utils }:
    flake-utils.lib.eachSystem ["x86_64-linux" "x86_64-darwin"] ( system:
      let
        pkgs = nixpkgs.legacyPackages.${system};
        hp = pkgs.haskellPackages.override ( old: {
          overrides = pkgs.lib.composeExtensions (old.overrides or (_: _: {})) (f: p: {
            hledger-time = f.callPackage ./. {};
          });
        });
      in
      rec {

        packages = { inherit (hp) hledger-time; };

        defaultPackage = packages.hledger-time;
        apps.hledger-time = {
          type = "app";
          program = "${hp.hledger-time}/bin/hledger-time";
        };
        devShell = hp.shellFor {
          packages = h: [h.hledger-time];
          withHoogle = false;
          buildInputs = with pkgs; [
            entr
            cabal-install
            hp.hlint
            stylish-haskell
            ghcid
            haskell-language-server
            hp.graphmod
          ];
        };
      }
    );
}