anchor.diff:  , libx11
   , libxrandr
   , libxrender
  -, mesa
  +, opengl-dummy
   , randrproto
   , renderproto
   , xf86vidmodeproto
  
positive.code:     libxrandr
      libxrender
      xorg.libXxf86vm
      mesa
      randrproto
      renderproto
      xf86vidmodeproto
      xproto
    ];
  
    meta = with lib; {
  
negative.code: , xproto
  }:
  
  let
    inherit (lib)
      boolOn;
  in
  stdenv.mkDerivation rec {
    name = "freeglut-3.0.0";
  
  