anchor.diff:  
       Note the ultimate "_" is replaced with "-" in the --name arg!
     '';
  +
  +  desktopItem = makeDesktopItem {
  +    name = "factorio";
  +    desktopName = "Factorio";
  +    comment = "A game in which you build and maintain factories.";
  +    exec = "factorio";
  +    icon = "factorio";
  +    type = "Application";
  +    categories = "Game";
  +  };
   
     branch = if experimental then "experimental" else "stable";
   
  
positive.code: { stdenv, fetchurl, makeWrapper
  , alsaLib, libpulseaudio, libX11, libXcursor, libXinerama, libXrandr, libXi, libGL
  , libSM, libICE, libXext, factorio-utils
  , releaseType
  
negative.code:       patchelf \
          --set-interpreter $(cat $NIX_CC/nix-support/dynamic-linker) \
          $out/bin/factorio
  
        mkdir -p $out/share/icons/hicolor/{64x64,128x128}/apps
        cp -a data/core/graphics/factorio-icon.png $out/share/icons/hicolor/64x64/apps/factorio.png
        cp -a data/core/graphics/factorio-icon@2x.png $out/share/icons/hicolor/128x128/apps/factorio.png
        ln -s ${desktopItem}/share/applications $out/share/
      '';
  
      meta = {
  