After installing hdf5 with homebrew, I needed to set the two env vars before pip3 install h5py: export HDF5_DIR="/opt/homebrew/Cellar/hdf5/1.13.0/" export CPATH="/opt/homebrew/include/" where 1.13.0 is the version of hdf5 installed.

We are seeing the same issue: https://github.com/justinchuby/barometer-project/issues/8. Looks like CMAltimeter.authorizationStatus() shows notDetermined, and I have not found a good way to request this authorization.