anchor.diff:      boost
       protobuf
       icu
  +    gtest
     ] ++ lib.optional stdenv.isDarwin Foundation;
   
     cmakeDir = "../cpp";
  +  cmakeFlags =
  +    lib.optionals (stdenv.hostPlatform != stdenv.buildPlatform) [
  +      "-DBUILD_GEOCODER=OFF"
  +      "-DPROTOC_BIN=${buildPackages.protobuf}/bin/protoc"
  +    ];
   
     checkPhase = "./libphonenumber_test";
   
  
positive.code: 
    nativeBuildInputs = [
      cmake
      gtest
      pkg-config
    ];
  
  
negative.code: { lib, stdenv, fetchFromGitHub, cmake, gtest, boost, pkg-config, protobuf, icu, Foundation, buildPackages }:
  
  stdenv.mkDerivation rec {
    pname = "phonenumber";
  