Help with ofxFaceRecognizer

I’ve been having a hell of a time trying to get this to run. Perhaps someone here can help me, starting with some of the instructions I’m a little unsure about:

modify Project.xcconfig as described in ofxOpenCV2461

In the ofxOpenCV2461 documentation, all I can find is

ofxOpenCV linking against OpenCV, including libraries for OSX.

CMake setting include: WITH_OPENCL = ON; WITH_EIGEN3 = ON.

Requires your project to link against ZLib and OpenCL.

Does any of this belong in the Project.xcconfig?

And how does one link a project “against ZLib and OpenCL”?

When I attempt to compile the example project, I get

Unknown type name ‘FaceRecognizer’; did you mean ‘ofxFaceRecognizer’?

If I fiddle with it a bit, the errors change to

Virtual function ‘getPixels’ has a different return type (‘unsigned char *’) than the function it overrides (which has return type ‘ofPixels_ &’)

I just updated the add-on