anchor.diff:        scotty
         shakespeare
         snap
  -      snap-loader-dynamic
  +      # Not building, can't figure it out.
  +      # snap-loader-dynamic
         snap-loader-static
         snap-templates
         snaplet-postgresql-simple
  
positive.code:     # haskell environment
      myHaskellEnv = haskellPackages.ghcWithHoogle (p: with p; [
        cabal-install
        ghc-mod
        hlint
        QuickCheck
        hspec
  
negative.code:         # See: https://github.com/snapframework/heist/pull/111
          heist = dontCheck super.heist;
  
          # Not sure why this is failing. Keeps saying missing directory
          # == 1.2.*, but I don't know where that comes from.
          #
          # snap-loader-dynamic = doJailbreak (super.snap-loader-dynamic.overrideAttrs (oldAttrs: {
          #   src = fetchgit {
          #     url = "https://github.com/snapframework/snap-loader-dynamic";
          #     rev = "2bbf96c4cad2b0c4e60e999607f68c1f6ddfdd92";
          #     sha256 = "0vp8b020wb2aj16nbbwnszxwfrhl1c1gz373gv4pbi5zx0m93fzf";
          #   };
          # }));
  
        } // (if stdenv.isDarwin then {
          # macOS-specific overrides
  
  