anchor.diff:      demoHpluvChroma = genDemoImage "hpluv-chroma";
       builder = builtins.toFile "builder.sh" ''
         source $stdenv/setup
  -      export NODE_PATH=$nodeModules:$NODE_PATH
  +      export NODE_PATH=$mustacheJs:$nodePackageDist:$NODE_PATH
   
         mkdir $out
         mkdir $out/images
  
positive.code: 
    website = pkgs.stdenv.mkDerivation rec {
      name = "hsluv-website";
      inherit nodejs nodeModules pickerJsDist;
      src = ./website;
      buildInputs = [nodejs];
      demoFavicon = genDemoImage "favicon";
  
negative.code:     sha256 = "09gx8ra0m52bm0zdfbwb151b5ngvv7bq1367pizsgmh5r4sqigzk";
    };
  
    genDemoImage = i : pkgs.stdenv.mkDerivation rec {
      name = "hsluv-demo-${i}";
      inherit nodejs imagemagick nodePackageDist;
      generateImagesJs = ./website/generate-images.js;
      buildInputs = [nodejs imagemagick];
      builder = builtins.toFile "builder.sh" ''
        source $stdenv/setup
        export NODE_PATH=$nodePackageDist:$NODE_PATH
        node $generateImagesJs ${i} > img.pam
        mkdir $out
        convert img.pam $out/${i}.png
  