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Cannot Figure Out How To Run OpenCV

Hi there, I'm somewhat new to programming and have just been introduced to OpenCV. I'm trying to use opencv_traincascade for a project to detect whether someone is sleeping while driving. After reading the tutorial:

I understand what I have to do in terms of the overall process. What I can't seem to do is get any of the opencv apps to work in terminal (I'm a MacOS user). Every time this is what happens:

fatal error: 'opencv2/core.hpp' file not found

when I type the command:

g++ -o traincascade traincascade.cpp

I downloaded OpenCV and tested it to make sure it worked in VSC with this tutorial:

And everything seemed to work fine. I know this is probably a dumb question but I cannot figure it out for the life of me. Any help is appreciated.