anchor.diff:        sha256 = "a5350777b191e910334d3a107b5e5219b72ffa393da4186da1e0a4552aeeded6";
       };
       "3" = {
  -      fetchzipVersion = 2;
  -      version = "3.1.7";
  -      sha256 = "5133c033d68d72991cb0b07e7ca1aa82f123e51e971f9fb2f6dc92d904749816";
  +      fetchzipVersion = 3;
  +      version = "3.2";
  +      sha256 = "f677cea3a50a6a000758266016b8480e037a74f7d4cc8c744f4e2cc473cf4b76";
       };
     };
   
     inherit (stdenv.lib)
  +    optionals
       optionalString;
   
     source = sources."${channel}";
  
positive.code:         inherit multihash sha256;
        };
  
    postInstall = optionalString (channel == "3") ''
      ln -s iperf3 $out/bin/iperf
    '';
  
negative.code: { stdenv
  , fetchFromGitHub
  , fetchurl
  
  , openssl
  
  , channel
  }:
  