anchor.diff:      libffi libvdpau libelf libXvMC
       libpthreadstubs openssl /*or another sha1 provider*/
     ] ++ lib.optionals (elem "wayland" eglPlatforms) [ wayland wayland-protocols ]
  -    ++ lib.optionals stdenv.isLinux [ valgrind-light libomxil-bellagio libva-minimal ];
  +    ++ lib.optionals stdenv.isLinux [ libomxil-bellagio libva-minimal ]
  +    ++ lib.optional withValgrind valgrind-light;
   
     enableParallelBuilding = true;
     doCheck = false;
  
positive.code: , vulkanDrivers ? null
  , eglPlatforms ? [ "x11" ] ++ lib.optionals stdenv.isLinux [ "wayland" "drm" ]
  , OpenGL, Xplugin
  }:
  
  /** Packaging design:
  
negative.code: , pkgconfig, intltool, autoreconfHook
  , file, expat, libdrm, xorg, wayland, wayland-protocols, openssl
  , llvmPackages, libffi, libomxil-bellagio, libva-minimal
  , libelf, libvdpau, python2, python2Packages
  , libglvnd
  , enableRadv ? true
  , galliumDrivers ? null
  