anchor.diff:    src = fetchurl {
       url = "https://github.com/mongodb/mongo-c-driver/releases/download"
         + "/${version}/${name}.tar.gz";
  -    sha256 = "630e83bfc97114a9936f0b6871bfd593b538839caf1d3f93c8038148d1b9a4d6";
  +    sha256 = "e5924207f6ccbdf74a9b95305b150e96b3296a71f2aafbb21e647dc28d580c68";
     };
   
     nativeBuildInputs = [
  
positive.code:   cmakeFlags = [
      "-DENABLE_TESTS=OFF"
      "-DENABLE_EXAMPLES=OFF"
      "-DENABLE_CRYPTO_SYSTEM_PROFILE=ON"
      "-DENABLE_MAN_PAGES=ON"
    ];
  
negative.code: 
    buildInputs = [
      cyrus-sasl
      icu
      openssl
      snappy
      zlib
  