title: Error using cmake
body: <p>I had CUDA 7.5 installed before and have just removed it and installed CUDA 8.0. After doing that, cmake has started giving error on any kind of compilation , giving these errors: </p>
  
  <pre><code>CMake Error at /usr/share/cmake-3.5/Modules/FindPackageHandleStandardArgs.cmake:148 (message):
    Could NOT find CUDA: Found unsuitable version "8.0", but required is exact
    version "7.5" (found /usr/local/cuda-8.0)
  Call Stack (most recent call first):
    /usr/share/cmake-3.5/Modules/FindPackageHandleStandardArgs.cmake:386 (_FPHSA_FAILURE_MESSAGE)
    /usr/share/cmake-3.5/Modules/FindCUDA.cmake:949 (find_package_handle_standard_args)
    /usr/local/share/OpenCV/OpenCVConfig.cmake:48 (find_package)
    /usr/local/share/OpenCV/OpenCVConfig.cmake:291 (find_host_package)
    CMakeLists.txt:3 (find_package)
  
  
  -- Configuring incomplete, errors occurred!
  See also "/home/cortana/Desktop/app/build/CMakeFiles/CMakeOutput.log".
  See also "/home/cortana/Desktop/app/build/CMakeFiles/CMakeError.log".
  </code></pre>
  
  <p>This error came up on compiling some opencv code. Considering that on not using cmake, the code compiles alright, opencv isn't broken. But cmake is showing such behaviour. Also, I am not even using cuda, so I dont know how its coming up. How can I remove this problem? </p>
  
  <p>Edit: 
  Here is my CMakeLists.txt:</p>
  
  <pre><code>cmake_minimum_required(VERSION 2.8)
  PROJECT (app)
  find_package(OpenCV REQUIRED )
  
  set( SRC
      code.cpp
  )
  
  
  INCLUDE_DIRECTORIES( ${CMAKE_CURRENT_SOURCE_DIR}/include )
  link_directories( ${CMAKE_BINARY_DIR}/bin)
  set(EXECUTABLE_OUTPUT_PATH ${CMAKE_BINARY_DIR}/bin)
  add_executable( {PROJECT_NAME} ${SRC} )
  
  target_link_libraries( {PROJECT_NAME} ${OpenCV_LIBS} )
  </code></pre>