在Cmakelist中添加opencv遇到的问题_"add the installation prefix of \"opencv\" to cmak

问题

编译一个开源项目，该项目的Cmakelist：

find_package(OpenCV QUIET COMPONENTS core highgui imgproc imgcodecs)
if(NOT OpenCV_FOUND)
    find_package(OpenCV REQUIRED COMPONENTS core highgui imgproc)
endif()
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cmake后出错：

CMake Error at examples/CMakeLists.txt:5 (find_package):
  By not providing "FindOpenCV.cmake" in CMAKE_MODULE_PATH this project has
  asked CMake to find a package configuration file provided by "OpenCV", but
  CMake did not find one.

  Could not find a package configuration file provided by "OpenCV" with any
  of the following names:

    OpenCVConfig.cmake
    opencv-config.cmake

  Add the installation prefix of "OpenCV" to CMAKE_PREFIX_PATH or set
  "OpenCV_DIR" to a directory containing one of the above files.  If "OpenCV"
  provides a separate development package or SDK,
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