How to install xfeatures2d on mac [closed]

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Hi,

I have installed the openCV 3.2.0 and now I want to install the extra modules (xfeatures2d). What is the easy way to install it ?

Thanks

UPDATE:

I follow the steps and when I press configure the second time I get errors:

CMake Error at cmake/OpenCVUtils.cmake:1043 (file): file DOWNLOAD cannot open file for write. Call Stack (most recent call first): opencv_contrib-master/modules/dnn/cmake/OpenCVFindLibProtobuf.cmake:32 (ocv_download) opencv_contrib-master/modules/dnn/CMakeLists.txt:5 (include)

CMake Error at cmake/OpenCVUtils.cmake:1047 (message): Failed to download . Status= Call Stack (most recent call first): opencv_contrib-master/modules/dnn/cmake/OpenCVFindLibProtobuf.cmake:32 (ocv_download) opencv_contrib-master/modules/dnn/CMakeLists.txt:5 (include)

Configuring incomplete, errors occurred! See also "/Users/rbfigueira/Desktop/Crazyflie/opencv-3.2.0/build/CMakeFiles/CMakeOutput.log". See also "/Users/rbfigueira/Desktop/Crazyflie/opencv-3.2.0/build/CMakeFiles/CMakeError.log