dlib OF compile erros

Undefined symbols for architecture x86_64:
  "dlib::entropy_decoder_kernel_2::set_stream(std::__1::basic_istream<char, std::__1::char_traits<char> >&)", referenced from:
      dlib::compress_stream_kernel_1<dlib::entropy_encoder_model_kernel_5<257ul, dlib::entropy_encoder_kernel_2, 200000ul, 4ul>, dlib::entropy_decoder_model_kernel_5<257ul, dlib::entropy_decoder_kernel_2, 200000ul, 4ul>, dlib::crc32>::decompress(std::__1::basic_istream<char, std::__1::char_traits<char> >&, std::__1::basic_ostream<char, std::__1::char_traits<char> >&) const in ofxDLib.o
  "dlib::entropy_decoder_kernel_2::entropy_decoder_kernel_2()", referenced from:
      dlib::compress_stream_kernel_1<dlib::entropy_encoder_model_kernel_5<257ul, dlib::entropy_encoder_kernel_2, 200000ul, 4ul>, dlib::entropy_decoder_model_kernel_5<257ul, dlib::entropy_decoder_kernel_2, 200000ul, 4ul>, dlib::crc32>::decompress(std::__1::basic_istream<char, std::__1::char_traits<char> >&, std::__1::basic_ostream<char, std::__1::char_traits<char> >&) const in ofxDLib.o
  "dlib::entropy_decoder_kernel_2::get_target(unsigned int)", referenced from:
      dlib::compress_stream_kernel_1<dlib::entropy_encoder_model_kernel_5<257ul, dlib::entropy_encoder_kernel_2, 200000ul, 4ul>, dlib::entropy_decoder_model_kernel_5<257ul, dlib::entropy_decoder_kernel_2, 200000ul, 4ul>, dlib::crc32>::decompress(std::__1::basic_istream<char, std::__1::char_traits<char> >&, std::__1::basic_ostream<char, std::__1::char_traits<char> >&) const in ofxDLib.o
      dlib::entropy_decoder_model_kernel_5<257ul, dlib::entropy_decoder_kernel_2, 200000ul, 4ul>::decode(unsigned long&) in ofxDLib.o
  "dlib::entropy_decoder_kernel_2::decode(unsigned int, unsigned int)", referenced from:
      dlib::compress_stream_kernel_1<dlib::entropy_encoder_model_kernel_5<257ul, dlib::entropy_encoder_kernel_2, 200000ul, 4ul>, dlib::entropy_decoder_model_kernel_5<257ul, dlib::entropy_decoder_kernel_2, 200000ul, 4ul>, dlib::crc32>::decompress(std::__1::basic_istream<char, std::__1::char_traits<char> >&, std::__1::basic_ostream<char, std::__1::char_traits<char> >&) const in ofxDLib.o
      dlib::entropy_decoder_model_kernel_5<257ul, dlib::entropy_decoder_kernel_2, 200000ul, 4ul>::decode(unsigned long&) in ofxDLib.o
  "dlib::entropy_decoder_kernel_2::~entropy_decoder_kernel_2()", referenced from:
      dlib::compress_stream_kernel_1<dlib::entropy_encoder_model_kernel_5<257ul, dlib::entropy_encoder_kernel_2, 200000ul, 4ul>, dlib::entropy_decoder_model_kernel_5<257ul, dlib::entropy_decoder_kernel_2, 200000ul, 4ul>, dlib::crc32>::decompress(std::__1::basic_istream<char, std::__1::char_traits<char> >&, std::__1::basic_ostream<char, std::__1::char_traits<char> >&) const in ofxDLib.o
  "_USER_ERROR__missing_dlib_all_source_cpp_file__OR__inconsistent_use_of_DEBUG_or_ENABLE_ASSERTS_preprocessor_directives_", referenced from:
      _dlib_check_consistent_assert_usage in main.o
  "dlib::base64::decode(std::__1::basic_istream<char, std::__1::char_traits<char> >&, std::__1::basic_ostream<char, std::__1::char_traits<char> >&) const", referenced from:
      dlib::get_serialized_frontal_faces() in ofxDLib.o
  "dlib::base64::base64()", referenced from:
      dlib::get_serialized_frontal_faces() in ofxDLib.o
  "dlib::base64::~base64()", referenced from:
      dlib::get_serialized_frontal_faces() in ofxDLib.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)