anchor.diff:      sha256 = "0qjvcj2cz7ypa91v95lws44fg8c1p0pazv24ljkai2m2r0jgsv8k";
     };
   
  +  # Of all the files in the source and data archives, there doesn't seem to be
  +  # a decent icon :-)
  +  iconsrc = fetchurl {
  +    url = "http://wiki.flightgear.org/images/6/62/FlightGear_logo.png";
  +    sha256 = "1ikz413jia55vfnmx8iwrlxvx8p16ggm81mbrj66wam3q7s2dm5p";
  +  };
  +
  +  desktopItem = makeDesktopItem {
  +    name = "flightgear";
  +    exec = "fgfs";
  +    icon = "${iconsrc}";
  +    comment = "FlightGear Flight Simulator";
  +    desktopName = "FlightGear";
  +    genericName = "Flight simulator";
  +    categories = "Game;Simulation";
  +  };
  +
     buildInputs = [
       freeglut freealut mesa libICE libjpeg openal openscenegraph plib
       libSM libunwind libX11 xproto libXext xextproto libXi inputproto
  
positive.code:   postInstall = ''
      mkdir -p "$out/share/FlightGear"
      tar xvf "${datasrc}" -C "$out/share/FlightGear/" --strip-components=1
    '';
  
    meta = with stdenv.lib; {
  
negative.code: , freeglut, freealut, mesa, libICE, libjpeg, openal, openscenegraph, plib
  , libSM, libunwind, libX11, xproto, libXext, xextproto, libXi, inputproto
  , libXmu, libXt, simgear, zlib, boost, cmake, libpng, udev, fltk13, apr
  , makeDesktopItem
  }:
  
  stdenv.mkDerivation rec {
  