anchor.diff: -{ stdenv, fetchurl, file, openssl }:
  +{ stdenv, fetchurl, file, openssl, perl }:
   
   stdenv.mkDerivation rec {
     name = "net-snmp-5.7.1";
  
positive.code:     sha256 = "07qqdgs3flraqccwry4a4x23jcg6vfi0rqj7clsibdv51ijwjwbw";
    };
  
    configureFlags =
      [ "--with-default-snmp-version=3"
        "--with-sys-location=Unknown"
  
negative.code:       "--with-persistent-directory=/var/lib/net-snmp"
      ];
  
    buildInputs = [ file openssl perl ];
  
    enableParallelBuilding = true;
  
  