-

Undefined symbols for architecture x86_64:
  "cv::fastMalloc(unsigned long)", referenced from:
      cv::Ptr<cv::flann::SearchParams>::Ptr(cv::flann::SearchParams*) in FindTheGhost-306b62.o
      cv::Ptr<cv::flann::IndexParams>::Ptr(cv::flann::IndexParams*) in FindTheGhost-306b62.o
  "cv::_InputArray::_InputArray(cv::Mat const&)", referenced from:
      _main in FindTheGhost-306b62.o
  "cv::drawMatches(cv::Mat const&, std::__1::vector<cv::KeyPoint, std::__1::allocator<cv::KeyPoint> > const&, cv::Mat const&, std::__1::vector<cv::KeyPoint, std::__1::allocator<cv::KeyPoint> > const&, std::__1::vector<cv::DMatch, std::__1::allocator<cv::DMatch> > const&, cv::Mat&, cv::Scalar_<double> const&, cv::Scalar_<double> const&, std::__1::vector<char, std::__1::allocator<char> > const&, int)", referenced from:
      _main in FindTheGhost-306b62.o
  "cv::_OutputArray::_OutputArray(cv::Mat&)", referenced from:
      _main in FindTheGhost-306b62.o
  "cv::FeatureDetector::~FeatureDetector()", referenced from:
      cv::Feature2D::~Feature2D() in FindTheGhost-306b62.o
  "cv::DescriptorMatcher::DescriptorCollection::~DescriptorCollection()", referenced from:
      cv::FlannBasedMatcher::~FlannBasedMatcher() in FindTheGhost-306b62.o
  "cv::DescriptorMatcher::knnMatch(cv::Mat const&, std::__1::vector<std::__1::vector<cv::DMatch, std::__1::allocator<cv::DMatch> >, std::__1::allocator<std::__1::vector<cv::DMatch, std::__1::allocator<cv::DMatch> > > >&, int, std::__1::vector<cv::Mat, std::__1::allocator<cv::Mat> > const&, bool)", referenced from:
      _main in FindTheGhost-306b62.o
  "cv::DescriptorMatcher::~DescriptorMatcher()", referenced from:
      cv::FlannBasedMatcher::~FlannBasedMatcher() in FindTheGhost-306b62.o
  "cv::FlannBasedMatcher::add(std::__1::vector<cv::Mat, std::__1::allocator<cv::Mat> > const&)", referenced from:
      _main in FindTheGhost-306b62.o
  "cv::FlannBasedMatcher::train()", referenced from:
      _main in FindTheGhost-306b62.o
  "cv::FlannBasedMatcher::FlannBasedMatcher(cv::Ptr<cv::flann::IndexParams> const&, cv::Ptr<cv::flann::SearchParams> const&)", referenced from:
      _main in FindTheGhost-306b62.o
  "cv::DescriptorExtractor::~DescriptorExtractor()", referenced from:
      cv::Feature2D::~Feature2D() in FindTheGhost-306b62.o
  "cv::Mat::deallocate()", referenced from:
      cv::Mat::release() in FindTheGhost-306b62.o
  "cv::Mat::copySize(cv::Mat const&)", referenced from:
      cv::Mat::Mat(cv::Mat const&) in FindTheGhost-306b62.o
  "cv::Mat::Mat(cv::Mat const&, cv::Rect_<int> const&)", referenced from:
      cv::Mat::operator()(cv::Rect_<int> const&) const in FindTheGhost-306b62.o
  "cv::SURF::SURF(double, int, int, bool, bool)", referenced from:
      _main in FindTheGhost-306b62.o
  "cv::SURF::SURF()", referenced from:
      _main in FindTheGhost-306b62.o
  "cv::flann::IndexParams::~IndexParams()", referenced from:
      cv::Ptr<cv::flann::IndexParams>::delete_obj() in FindTheGhost-306b62.o
  "cv::flann::IndexParams::~IndexParams()", referenced from:
      cv::flann::SearchParams::~SearchParams() in FindTheGhost-306b62.o
  "cv::flann::SearchParams::SearchParams(int, float, bool)", referenced from:
      _main in FindTheGhost-306b62.o
  "cv::flann::KDTreeIndexParams::KDTreeIndexParams(int)", referenced from:
      _main in FindTheGhost-306b62.o
  "cv::imread(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, int)", referenced from:
      _main in FindTheGhost-306b62.o
  "cv::imshow(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, cv::_InputArray const&)", referenced from:
      _main in FindTheGhost-306b62.o
  "cv::cvtColor(cv::_InputArray const&, cv::_OutputArray const&, int, int)", referenced from:
      _main in FindTheGhost-306b62.o
  "cv::fastFree(void*)", referenced from:
      cv::Ptr<cv::flann::SearchParams>::release() in FindTheGhost-306b62.o
      cv::Ptr<cv::flann::IndexParams>::release() in FindTheGhost-306b62.o
      cv::Ptr<cv::flann::Index>::release() in FindTheGhost-306b62.o
      cv::Mat::~Mat() in FindTheGhost-306b62.o
  "cv::Algorithm::~Algorithm()", referenced from:
      cv::SURF::~SURF() in FindTheGhost-306b62.o
  "cv::threshold(cv::_InputArray const&, cv::_OutputArray const&, double, double, int)", referenced from:
      _main in FindTheGhost-306b62.o
  "cv::FeatureDetector::detect(cv::Mat const&, std::__1::vector<cv::KeyPoint, std::__1::allocator<cv::KeyPoint> >&, cv::Mat const&) const", referenced from:
      _main in FindTheGhost-306b62.o
  "cv::Feature2D::compute(cv::Mat const&, std::__1::vector<cv::KeyPoint, std::__1::allocator<cv::KeyPoint> >&, cv::Mat&) const", referenced from:
      _main in FindTheGhost-306b62.o
  "VTT for cv::SURF", referenced from:
      cv::SURF::~SURF() in FindTheGhost-306b62.o
  "vtable for cv::FlannBasedMatcher", referenced from:
      cv::FlannBasedMatcher::~FlannBasedMatcher() in FindTheGhost-306b62.o
  NOTE: a missing vtable usually means the first non-inline virtual member function has no definition.
  "_cvWaitKey", referenced from:
      _main in FindTheGhost-306b62.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)