anchor.diff:  { lib
   , stdenv
   , enableNvidiaCgToolkit ? false
  +, withGamemode ? stdenv.isLinux
   , withVulkan ? stdenv.isLinux
   , alsa-lib
   , AppKit
  
positive.code: , ffmpeg
  , Foundation
  , freetype
  , libdrm
  , libGL
  , libGLU
  
negative.code:   src = fetchFromGitHub {
      owner = "libretro";
      repo = "RetroArch";
      sha256 = "sha256-bpTSzODVRKRs1OW6JafjbU3e/AqdQeGzWcg1lb9SIyo=";
      rev = "v${version}";
    };
  
  