title: How to link opencv to ROS indigo (catkin) with CMake (ubuntu 14.04)
body: <p>Am so far not able to use cv_bridge. Am getting this compilation error</p>
  
  <pre><code>CMake Error at /opt/ros/indigo/share/cv_bridge/cmake/cv_bridgeConfig.cmake:106 (message):
    Project 'cv_bridge' specifies '/usr/include/opencv' as an include dir,
    which is not found.  It does neither exist as an absolute directory nor in
    '/opt/ros/indigo//usr/include/opencv'.  Ask the maintainer ..
  </code></pre>
  
  <p>May be the problem in my CMake (...?)</p>
  
  <pre><code>cmake_minimum_required(VERSION 2.8.3)
  project(XY)
  
  find_package(catkin REQUIRED COMPONENTS
  cv_bridge
  image_transport
  roscpp
  rospy
  std_msgs
  )
  
  #set(OpenCV_DIR "/usr/local/lib/opencv")
  find_package(OpenCV REQUIRED core imgproc highgui PATHS /home/polar/soft/lib/opencv/opencv-3.1.0/cmake)
  include_directories( ${OpenCV_INCLUDE_DIRS} )
  
  if(OpenCV_FOUND)
  # include_directories(${Boost_INCLUDE_DIRS})
  message("\n\n OpenCV found!!!! \n\n")   
  endif()
  </code></pre>
  
  <p>Any idea on the cause of the problem and how to solve it please? 
  I was using ROS fuerte in the past and never experience such problems....</p>