anchor.diff:  { lib
   , stdenv
  -, fetchgit
  +, fetchFromGitHub
   , cmake
   , pkg-config
   , libusb1
  
positive.code: 
    buildInputs = [ libusb1 ];
  
    cmakeFlags = lib.optional stdenv.isLinux "-DINSTALL_UDEV_RULES=ON";
  
    meta = with lib; {
      description = "Turns your Realtek RTL2832 based DVB dongle into a SDR receiver";
  
negative.code: 
  stdenv.mkDerivation rec {
    pname = "rtl-sdr";
    version = "0.8.0";
  
    src = fetchFromGitHub {
      owner = "librtlsdr";
      repo = "librtlsdr";
      rev = "v${version}";
      sha256 = "1fgxlkgmdchbrf0nn98ivjr6css5hak3608nr4xrf2qzf7xy2kdk";
    };
  
    postPatch = ''
  