Pose Estimation Tutorial not compiling

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I am trying to follow this: https://docs.opencv.org/3.4.4/dc/d2c/tutorial_real_time_pose.html

I create a directory "build" in

opencv/samples/cpp/tutorial_code/calib3d/real_time_pose_estimation

and run cmake ..

I get this:

CMake Error at CMakeLists.txt:15 (ocv_include_modules_recurse):
  Unknown CMake command "ocv_include_modules_recurse".


CMake Warning (dev) in CMakeLists.txt:
  No cmake_minimum_required command is present.  A line of code such as

    cmake_minimum_required(VERSION 3.13)

I have OpenCV 2.4 compiled with open_contrib and 3.4 without. Usually when I compile a .cpp program that uses openCV I run.

g++ $(pkg-config --cflags --libs /usr/local/Cellar/opencv@3/3.4.5/lib/pkgconfig/opencv.pc) -std=c++11 main.cpp

since I am on MacOS. Should I ignore cmake and compile it like that ? How do I fix the error ?