anchor.diff:          outputHash
           outputHashAlgo
           urls;
  -      md5Url = "https://github.com/zeromq/libzmq/releases/download/v${version}/"
  -        + "MD5SUMS";
  -      sha1Url = "https://github.com/zeromq/libzmq/releases/download/"
  -        + "v${version}/SHA1SUMS";
         failEarly = true;
  +      fullOpts = {
  +        md5Url = "https://github.com/zeromq/libzmq/releases/download/v${version}/"
  +          + "MD5SUMS";
  +        sha1Url = "https://github.com/zeromq/libzmq/releases/download/"
  +          + "v${version}/SHA1SUMS";
  +      };
       };
     };
   
  
positive.code: , krb5_lib
  , libsodium
  , libunwind
  , util-linux_lib
  }:
  
  let
    version = "4.2.5";
  in
  stdenv.mkDerivation rec {
    name = "zeromq-${version}";
  
negative.code:     url = "https://github.com/zeromq/libzmq/releases/download/v${version}/"
        + "${name}.tar.gz";
      hashOutput = false;
      sha256 = "bcbabe1e2c7d0eec4ed612e10b94b112dd5f06fcefa994a0c79a45d835cd21eb";
    };
  
    buildInputs = [
      krb5_lib
      libsodium
      libunwind
    ];
  
    configureFlags = [
  