anchor.diff:    configureFlags = [ "--with-perl=${perl}/bin/perl" ];
   
     nativeBuildInputs = [ pkg-config ];
  -  buildInputs = [ libpcap bison cyrus_sasl tcp_wrappers flex ];
  +  buildInputs = [ libpcap bison cyrus_sasl tcp_wrappers flex libnsl ];
   
     meta = with lib; {
       description = "Clients for ARGUS";
  
positive.code:     sha256 = "1c9vj6ma00gqq9h92fg71sxcsjzz912166sdg90ahvnmvmh3l1rj";
    };
  
    patchPhase = ''
      for file in ./examples/*/*.pl; do
        substituteInPlace $file \
          --subst-var-by PERLBIN ${perl}/bin/perl
  
negative.code: { lib, stdenv, fetchurl, libpcap, bison, flex, cyrus_sasl, tcp_wrappers, pkg-config, perl, libtirpc, libnsl }:
  
  stdenv.mkDerivation rec {
    pname = "argus-clients";
  