anchor.diff:  
     meta = with stdenv.lib; {
       description = "facetimehd firmware";
  -    homepage = https://support.apple.com/downloads/DL1877;
  +    homepage = https://support.apple.com/kb/DL1877;
       license = licenses.unfree;
       maintainers = with maintainers; [ womfoo grahamc ];
       platforms = [ "i686-linux" "x86_64-linux" ];
  
positive.code: 
  let
  
    version = "1.43_4";
  
  
    # Updated according to https://github.com/patjak/bcwc_pcie/pull/81/files
  
negative.code:   inherit version;
    src = fetchurl {
      url = dmgUrl;
      sha256 = "0s8crlh8rvpanzk1w4z3hich0a3mw0m5xhpcg07bxy02calhpdk1";
      curlOpts = "-r ${dmgRange}";
    };
  
  