anchor.diff:  
   stdenv.mkDerivation rec {
     pname = "arp-scan";
  -  version = "1.9.5";
  +  version = "1.9.7";
   
     src = fetchFromGitHub {
       owner = "royhills";
       repo = "arp-scan";
  -    rev = "4de863c2627a05177eda7159692a588f9f520cd1";
  -    sha256 = "15zpfdybk2kh98shqs8qqd0f9nyi2ch2wcyv729rfj7yp0hif5mb";
  +    rev = version;
  +    sha256 = "1mf7a4f9vzvnkiavc87aqyciswggsb4fpy7j05jxnvjyyxv3l7gp";
     };
   
     perlModules = with perlPackages; [
  
positive.code:   ];
  
    nativeBuildInputs = [ autoreconfHook ];
    buildInputs = [ libpcap makeWrapper ];
  
    postInstall = ''
      for name in get-{oui,iab}; do
        wrapProgram "$out/bin/$name" --set PERL5LIB "${perlPackages.makePerlPath perlModules }"
      done;
    '';
  
  
negative.code:       Arp-scan is a command-line tool that uses the ARP protocol to discover
        and fingerprint IP hosts on the local network.
      '';
      homepage = "http://www.nta-monitor.com/wiki/index.php/Arp-scan_Documentation";
      license = licenses.gpl3;
      platforms = platforms.linux;
      maintainers = with maintainers; [ bjornfor mikoim ];
  