anchor.diff: -{ lib, stdenv, fetchFromGitHub, cmake, gtest, boost, pkg-config, protobuf, icu, Foundation }:
  +{ lib, stdenv, fetchFromGitHub, cmake, gtest, boost, pkg-config, protobuf, icu, Foundation, buildPackages }:
   
   stdenv.mkDerivation rec {
     pname = "phonenumber";
  
positive.code:     boost
      protobuf
      icu
    ] ++ lib.optional stdenv.isDarwin Foundation;
  
    cmakeDir = "../cpp";
  
    checkPhase = "./libphonenumber_test";
  
  
negative.code: 
    nativeBuildInputs = [
      cmake
      pkg-config
    ];
  
  