Some problems Sam was having with the fortan kdtree has alerted me to some necessary changes due to changes in Forthon. Two of them are simple. One is to remove a --with-numpy flag in the Makefile. The second is that the most recent version of Forthon (0.8.9) builds the fKDpy.so object in it's own build/lib.arch.../ directory, not in the same directory as the Makefile. This is easily fixed by a change to the setup.py file in yt/utilities. I will issue a PR for this depending on the discussion of the following issue.
The not-simple change is that the newest Forthon setup.py is hard-coded to install the Forthon package for the system Python, regardless of which actual Python stack you're using, which is not convenient for our custom-curated yt stack. The fix is to simply remove the hard-coding. But I want to ask y'all what the best course forward from here is: A) ask the author to change it, B) make the change in the Forthon linked to in the install_script, or C) stick to the old version for now?