anchor.diff: -{ buildFHSChrootEnv }:
  +{ buildFHSChrootEnv, config }:
   
   buildFHSChrootEnv {
     name = "steam";
  
positive.code:         pkgs.xlibs.libXtst
          pkgs.xlibs.libXxf86vm
  
          pkgs.libpng12
          pkgs.mesa
          pkgs.SDL
  
          pkgs.libgcrypt
          pkgs.zlib
  
negative.code:       pkgs.python
        pkgs.gnome2.zenity
        pkgs.xdg_utils
      ]
      ++ (if config.steam.java or false then [ pkgs.jdk ] else [ ])
      ;
  
    multiPkgs = pkgs:
        [ pkgs.cairo
  