[archlinux]: Issue installing latest version

[appetrosyan]

At present, the following code snippet

import pypolychord as pp
from pypolychord.settings import PolyChordSettings as Settings
from mpi4py import MPI

Results in the following output

---------------------------------------------------------------------------
ImportError                               Traceback (most recent call last)
Cell In[6], line 1
----> 1 import pypolychord as pp
      2 from pypolychord.settings import PolyChordSettings as Settings
      3 from mpi4py import MPI

File /usr/lib/python3.11/site-packages/pypolychord/__init__.py:3
      1 __version__ = "1.20.1"
      2 from pypolychord.settings import PolyChordSettings
----> 3 from pypolychord.polychord import run_polychord

File /usr/lib/python3.11/site-packages/pypolychord/polychord.py:3
      1 from pypolychord.output import PolyChordOutput
      2 import os
----> 3 import _pypolychord
      4 import numpy as np
      7 def default_prior(cube):

ImportError: libmpi_cxx.so.40: cannot open shared object file: No such file or directory

Possible causes

I think that the AUR package needs to update to the latest MPI. I have not done so before, but would be happy to do so if one needs to.

Who can help

@williamjameshandley

[appetrosyan]

Duplicate of #120