mac os cmake problem

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mac os high sierra

version:10.13.3

CMake Error at library/CMakeLists.txt:6 (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, be sure it has been installed.

-- Configuring incomplete, errors occurred! See also "/Users/kang/Desktop/FaceDetector-master/Core/CMakeFiles/CMakeOutput.log".