{ pkgs ? import <nixpkgs> {}
, ghc ? null
, withHoogle ? false
}:
let
  haskellPackages =
    if ghc == null
    then pkgs.haskellPackages
    else pkgs.haskell.packages.${ghc};
  hs = haskellPackages.extend (with pkgs.haskell.lib;
    hself: hsuper: {
      #hakyll = unmarkBroken hsuper.hakyll;
      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" {};
      /*
      hakyll = appendConfigureFlags ((hself.callHackage "hakyll" "4.13.4.1" {}))
                                    ["-f-usePandoc" "-f-previewServer" "-f-watchServer"];
      pandoc-sidenote = null;
      sourcephile_web = hself.callPackage ./sourcephile_web.nix {};
      */
    } //
    packageSourceOverrides {
      sourcephile_web = ./.;
      #sourcephile_web = ./sourcephile_web.nix;
    } hself hsuper
  );
in hs.sourcephile_web // {
  shell = hs.shellFor {
    packages = p: [ p.sourcephile_web ];
    nativeBuildInputs = [
      hs.cabal-install
      #hs.hpack
      hs.haskell-language-server
      #hs.hpc
    ];
    buildInputs = [
      #hs.ghcid
      #hs.ormolu
      #hs.hlint
      #pkgs.nixpkgs-fmt
    ];
    inherit withHoogle;
  };
}