anchor.diff:  , withVulkan ? stdenv.isLinux
   , alsa-lib
   , AppKit
  +, dbus
   , fetchFromGitHub
   , ffmpeg_4
   , Foundation
  
positive.code:     lib.optionals stdenv.isDarwin [ libobjc AppKit Foundation ] ++
      lib.optionals stdenv.isLinux [
        alsa-lib
        libX11
        libXdmcp
        libXext
  
negative.code: 
    enableParallelBuilding = true;
  
    configureFlags = lib.optionals stdenv.isLinux [ "--enable-kms" "--enable-egl" "--enable-dbus" ];
  
    postInstall = ''
      mkdir -p $out/share/libretro/info
  