anchor.diff:          pkgs.pango
   
           pkgs.freetype
  +        pkgs.fontconfig
           pkgs.xlibs.libICE
           pkgs.xlibs.libSM
           pkgs.xlibs.libX11
  
positive.code: { buildFHSChrootEnv }:
  
  buildFHSChrootEnv {
    name = "steam";
  
negative.code:         pkgs.xlibs.libXtst
          pkgs.xlibs.libXxf86vm
  
          pkgs.ffmpeg
          pkgs.libpng12
          pkgs.mesa
          pkgs.SDL
          pkgs.SDL2
  
          pkgs.libgcrypt
          pkgs.zlib
  