anchor.diff:    name = "net-snmp-5.7.3";
   
     src = fetchurl {
  -    url = "mirror://sourceforge/net-snmp/${name}.zip";
  -    multihash = "QmPjQkxMk6KDfjDnTFG322EKsbVzdAnnbnNPR4tMLCGy9n";
  -    sha256 = "0gkss3zclm23zwpqfhddca8278id7pk6qx1mydpimdrrcndwgpz8";
  +    url = "mirror://sourceforge/net-snmp/${name}.tar.gz";
  +    allowHashOutput = false;
  +    multihash = "QmW7RctNcJdAKcqoayYwRUDWmzbZHAT4R3tLvpFuFBWxLE";
  +    sha256 = "12ef89613c7707dc96d13335f153c1921efc9d61d3708ef09f3fc4a7014fb4f0";
     };
   
     nativeBuildInputs = [
       file
       perlPackages.perl
  -    unzip
     ];
   
     buildInputs = [
  
positive.code: , fetchurl
  , file
  , perlPackages
  , unzip
  
  , openssl
  }:
  
negative.code:     )
    '';
  
    passthru = {
      srcVerification = fetchurl {
        failEarly = true;
        pgpsigUrls = map (n: "${n}.asc") src.urls;
        pgpKeyFingerprint = "27CA A4A3 2E37 1383 A33E  D058 7D5F 9576 E0F8 1533";
        inherit (src) urls outputHash outputHashAlgo;
      };
    };
  
    meta = with stdenv.lib; {
      description = "Clients and server for the SNMP network monitoring protocol";
      homepage = http://net-snmp.sourceforge.net/;
  