{
inputs.nixpkgs.url = "flake:nixpkgs";
outputs = inputs: let
  pkg = "literate-accounting";
  lib = inputs.nixpkgs.lib;
  forAllSystems = f: lib.genAttrs lib.systems.supported.hydra (system: f rec {
    inherit system;
    pkgs = inputs.nixpkgs.legacyPackages.${system};
    haskellPackages = pkgs.haskellPackages.extend (with pkgs.haskell.lib; hfinal: hsuper: {
      ${pkg} = buildFromSdist (hsuper.callCabal2nix pkg ./. {});
      #hakyll = hself.callHackage "hakyll" "4.13.4.1" {};
      ##hakyll-sass = unmarkBroken hsuper.hakyll-sass;
      #hakyll-sass = hself.callHackage "hakyll-sass" "0.2.4" {};
      ## hakyll 4.13.4 requires pandoc 2.10
      #pandoc = hself.callHackage "pandoc" "2.10.1" {};
      #pandoc-types = hself.callHackage "pandoc-types" "1.21" {};
      #skylighting = hself.callHackage "skylighting" "0.8.5" {};
      #skylighting-core = hself.callHackage "skylighting-core" "0.8.5" {};
    });
  });
  in {
    # nix -L build
    defaultPackage = forAllSystems ({haskellPackages, ...}: haskellPackages.${pkg});
    # nix -L develop
    devShell = forAllSystems ({pkgs, haskellPackages, ...}:
      haskellPackages.shellFor {
        packages = ps: [ ps.${pkg} ];
        nativeBuildInputs = [
          haskellPackages.cabal-install
          haskellPackages.fourmolu
          haskellPackages.ghcid
          haskellPackages.haskell-language-server
          haskellPackages.hlint
          pkgs.git-chglog
          pkgs.reuse
        ];
        withHoogle = false;
      });
  };
}