anchor.diff:  
     src = fetchurl {
       url = "http://download.videolan.org/pub/videolan/${baseName}/${version}/${baseName}-${version}.tar.bz2";
  -    sha256 = "155sah8z4vbp6j3sq9b17mcn6rj1938ijszz97m8pd2cgif58i2y";
  +    sha256 = "1s5v075hnbs57995r6lljm79wgrip3gnyf55a0y7bja75jh49hwm";
     };
   
     buildInputs = [ libgcrypt libgpgerror ];
  
positive.code:   nativeBuildInputs = [ yacc flex ];
  
    meta = with stdenv.lib; {
      homepage = http://www.videolan.org/developers/libbluray.html;
      description = "Library to access AACS protected Blu-Ray disks";
      license = licenses.lgpl21;
      maintainers = with maintainers; [ abbradar ];
  
negative.code: # https://wiki.archlinux.org/index.php/BluRay
  
  let baseName = "libaacs";
      version  = "0.8.1";
  in
  
  stdenv.mkDerivation {
  