I have tried installing mpi4py using pip install mpi4py, but it gives me the error:
mpi.h no such file or directory
could not build wheel for mpi4py, which is required to install pyproject.toml-based projects.
I found that the system does not have libopenmpi-dev, but I cannot install it in a separate environment, due to some network error. How can I install mpi4py regardless?