anchor.diff:          pkgs.pango
   
           pkgs.freetype
  +        pkgs.fontconfig
           pkgs.xlibs.libICE
           pkgs.xlibs.libSM
           pkgs.xlibs.libX11
  
positive.code:       pkgs.python
        pkgs.gnome2.zenity
        pkgs.xdg_utils
      ];
  
    multiPkgs = pkgs:
        [ pkgs.cairo
  
negative.code: { buildFHSChrootEnv, config }:
  
  buildFHSChrootEnv {
    name = "steam";
  