To fix Mac problems with "make data":

Find the path to python3 using "which":

% which python3

Change the *first line* of goldprep.py to point to this location instead of to /usr/bin/python3

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To fix permission problems, for instance, that "goldprep.py" shows a permission error:

% chmod 777 goldprep.py

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colordiff

Linux:

If you have a missing colordiff, then

% sudo apt-get install colordiff

Mac:

one way to fix missing "colordiff" is to edit the Makefile. Change DIFF=colordiff to DIFF=diff

-OR- just install it:

% brew install colordiff

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Mac: to fix missing "/bin/less", edit the Makefile. Change PAGER=/bin/less to PAGER=less