g++ -O3 -std=c++11 `pkg-config --cflags --libs tesseract opencv` my_first.cpp -o my_first

cmake_minimum_required(VERSION 2.6)
add_compile_options(-std=c++11)
project (my_first)

find_package(PkgConfig REQUIRED)
pkg_check_modules (OPENCV REQUIRED opencv)
link_directories(${OPENCV_LIBRARY_DIRS})

pkg_check_modules (TESSERACT REQUIRED tesseract)
link_directories(${TESSERACT_LIBRARY_DIRS})

add_executable(myfirst my_first.cpp)

/usr/local/Cellar/cmake/3.11.3/bin/cmake --build
/Users/ggovindan/tessaract_ocr/tesseract/experiments/cmake-build-debug --target all -- -j 4
[ 50%] Linking CXX executable myfirst
Undefined symbols for architecture x86_64:
  "cv::Mat::deallocate()", referenced from:
      cv::Mat::release() in my_first.cpp.o
  "cv::String::deallocate()", referenced from:
      cv::String::~String() in my_first.cpp.o
      cv::String::operator=(cv::String const&) in my_first.cpp.o
  "cv::String::allocate(unsigned long)", referenced from:
      cv::String::String(std::__1::basic_string<char,
std::__1::char_traits<char>, std::__1::allocator<char> > const&) in
my_first.cpp.o
  "cv::imread(cv::String const&, int)", referenced from:
  _main in my_first.cpp.o
  "cv::fastFree(void*)", referenced from:
    cv::Mat::~Mat() in my_first.cpp.o
  "tesseract::TessBaseAPI::GetUTF8Text()", referenced from:
  _main in my_first.cpp.o
  "tesseract::TessBaseAPI::SetPageSegMode(tesseract::PageSegMode)", referenced from:
  _main in my_first.cpp.o
  "tesseract::TessBaseAPI::Init(char const*, char const*,
tesseract::OcrEngineMode, char**, int, GenericVector<STRING> const*,
GenericVector<STRING> const*, bool)", referenced from:
  tesseract::TessBaseAPI::Init(char const*, char const*,
tesseract::OcrEngineMode) in my_first.cpp.o
  "tesseract::TessBaseAPI::SetImage(unsigned char const*, int, int, int, int)", referenced from:
  _main in my_first.cpp.o
  "tesseract::TessBaseAPI::TessBaseAPI()", referenced from:
  _main in my_first.cpp.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see
invocation)
make[2]: *** [myfirst] Error 1
make[1]: *** [CMakeFiles/myfirst.dir/all] Error 2
make: *** [all] Error 2