anchor.diff:      version = 3;
       owner = "gnome-mpv";
       repo = "gnome-mpv";
  -    rev = "be654fb2ca9833d8ac19bd8cada28071a360acf2";
  -    sha256 = "30f6975c84de0a2518f6dc74d55f58748dcbd4d121a58fce5dc2fb1c9e16d887";
  +    rev = "2e13ab37fffdb2124d62872994de6b79a128f9cb";
  +    sha256 = "cbd5d22ba1722e980f59290ebcdb0ed8a4351631e4010bc2c337344de89e7934";
     };
   
     nativeBuildInputs = [
  
positive.code:     "--enable-schemas-compile"
      "--disable-debug"
      "--enable-opencl-cb"
      "--${boolEn (appstream-glib != null)}-appstream-util"
    ];
  
    preFixup = ''
  
negative.code:   inherit (lib)
      boolEn;
  
    version = "2017-08-10";
  in
  stdenv.mkDerivation rec {
    name = "gnome-mpv-${version}";
  