anchor.diff:      "--disable-docs"
       "--enable-drm"
       "--enable-x11"
  -    "--enable-glx"
  -    "--enable-egl"
  +    "--${boolEn opengl-dummy.glx}-glx"
  +    "--${boolEn opengl-dummy.egl}-egl"
       "--enable-wayland"
       "--enable-va-messaging"
       "--enable-dummy-driver"
  
positive.code: , libx11
  , libxext
  , libxfixes
  , mesa
  , mesa_noglu
  , wayland
  }:
  
  let
    version = "1.8.3";
  in
  stdenv.mkDerivation rec {
  
negative.code:     libx11
      libxext
      libxfixes
      opengl-dummy
      wayland
    ];
  
  