Undefined symbols for architecture x86_64:
  "absl::numbers_internal::FastIntToBuffer(unsigned long long, char*)", referenced from:
      char* absl::numbers_internal::FastIntToBuffer<unsigned long>(unsigned long, char*) in cord.o
  "absl::StrCat(absl::AlphaNum const&, absl::AlphaNum const&)", referenced from:
      absl::strings_internal::CordTestAccess::LengthToTag(unsigned long) in cord.o
  "absl::StrCat(absl::AlphaNum const&, absl::AlphaNum const&, absl::AlphaNum const&, absl::AlphaNum const&)", referenced from:
      absl::Cord::RemovePrefix(unsigned long) in cord.o
      absl::Cord::RemoveSuffix(unsigned long) in cord.o
  "absl::CEscape(absl::string_view)", referenced from:
      absl::DumpNode(absl::cord_internal::CordRep*, bool, std::__1::basic_ostream<char, std::__1::char_traits<char> >*) in cord.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)