title: Linking problem with OpenCV and CMake
body: <p>I am writing a program which uses OpenCV (installed in a local directory, since I don't have root permissions on that machine), and I have written the corresponding CMakeLists.txt file. My problem is that the compilation fails at the linking stage in different ways (I've spent three hours trying all the different solutions proposed on the web, so I've seen plenty of outcomes).
  Here you are the configurations/results which make more sense to me, even though they lead to a failure:
  [in project_root/CMakeLists.txt]:</p>
  
  <pre><code>cmake_minimum_required(VERSION 2.8)
  project(CUDA_learning)
  
  set(OpenCV_INCLUDE_DIR "path/to/opencv_CUDA/include")
  include_directories(${OpenCV_INCLUDE_DIR})
  set(OpenCV_LIBS_DIR "path/to/opencv_CUDA/lib")
  link_directories(${OpenCV_LIBS_DIR})
  set(OpenCV_LIBS "opencv_core opencv_imgproc opencv_calib3d opencv_video opencv_features2d opencv_ml opencv_highgui opencv_objdetect opencv_contrib opencv_legacy opencv_gpu")
  
  find_package(Boost COMPONENTS system filesystem program_options regex REQUIRED)
  if(Boost_FOUND)
    include_directories(${Boost_INCLUDE_DIR})
  else(Boost_FOUND)
    message(FATAL_ERROR "Cannot build application without Boost. Please set Boost_INCLUDE_DIR.")
  endif(Boost_FOUND)
  
  set(CMAKE_BUILD_TYPE debug)
  
  add_definitions("-Wall")
  
  set(EXECUTABLE_OUTPUT_PATH ${CMAKE_BINARY_DIR}/../bin)
  
  subdirs (
    ../src
  )
  </code></pre>
  
  <p>[in project_root/src/CMakeLists.txt]:</p>
  
  <pre><code>FILE(GLOB dir_source *.cc 2D/*.cc)
  FILE(GLOB dir_header *.hh 2D/*.hh)
  
  add_executable(${PROJECT_NAME} ${dir_source} ${dir_header})
  target_link_libraries(${PROJECT_NAME} ${Boost_PROGRAM_OPTIONS_LIBRARY} ${Boost_FILESYSTEM_LIBRARY} ${Boost_SYSTEM_LIBRARY} ${OpenCV_LIBS})
  </code></pre>
  
  <p>Outcome:</p>
  
  <pre><code>Linking CXX executable ../../bin/CUDA_learning
  c++: opencv_imgproc: No such file or directory
  c++: opencv_calib3d: No such file or directory
  c++: opencv_video: No such file or directory
  c++: opencv_features2d: No such file or directory
  c++: opencv_ml: No such file or directory
  c++: opencv_highgui: No such file or directory
  c++: opencv_objdetect: No such file or directory
  c++: opencv_contrib: No such file or directory
  c++: opencv_legacy: No such file or directory
  c++: opencv_gpu: No such file or directory
  </code></pre>
  
  <p>If, contrary to the recommendations given on the net, I put a "-l" before the OpenCV library name I get:</p>
  
  <pre><code>Linking CXX executable ../../bin/CUDA_learning
  /usr/bin/ld: cannot find -lopencv_core
  collect2: ld returned 1 exit status
  make[2]: *** [../bin/CUDA_learning] Error 1
  make[1]: *** [src/CMakeFiles/CUDA_learning.dir/all] Error 2
  make: *** [all] Error 2
  </code></pre>
  
  <p>Does anyone know how to solve this thing? I am literally driving crazy on this...
  Thanks a lot in advance!
  Cheers,
  Rob</p>