anchor.diff:  
     buildInputs = [
       cyrus-sasl
  +    icu
       openssl
       snappy
       zlib
  
positive.code:   src = fetchurl {
      url = "https://github.com/mongodb/mongo-c-driver/releases/download"
        + "/${version}/${name}.tar.gz";
      sha256 = "630e83bfc97114a9936f0b6871bfd593b538839caf1d3f93c8038148d1b9a4d6";
    };
  
    nativeBuildInputs = [
  
negative.code: , python3Packages
  
  , cyrus-sasl
  , icu
  , openssl
  , snappy
  , zlib
  }:
  
  let
    version = "1.12.0";
  in
  stdenv.mkDerivation rec {
    name = "mongo-c-driver-${version}";
  