MEX_CAMMAND - how to set its path?

I am stuck in this step:

MEX_COMMAND: Path to the mex compiler. Defaults to assume the path is included in your shell's PATH environment variable. mex is installed with matlab at $MATLABROOT/bin/mex

$MATLABROOT can be found by executing the command 'matlabroot' in MATLAB

Can you provide me with the exact example? My matlabroot is C:\Program Files\MATLAB\R2017a

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