Missing GLIBCXX_3.4.30

[DarioMarzella]

On some systems this error can occur because of missing libdist libraries:

Traceback (most recent call last):
  File "/home/User/softwares/pdbprep/add_ff_hydrogens.py", line 11, in <module>
    import openmm
  File "/home/User/miniconda3/envs/pdbprep/lib/python3.11/site-packages/openmm/__init__.py", line 24, in <module>
    from openmm.openmm import *
  File "/home/User/miniconda3/envs/pdbprep/lib/python3.11/site-packages/openmm/openmm.py", line 10, in <module>
    from . import _openmm
ImportError: /home/User/miniconda3/envs/pdbprep/lib/python3.11/site-packages/openmm/../../../libstdc++.so.6: version `GLIBCXX_3.4.30' not found (required by /home/User/miniconda3/envs/pdbprep/lib/python3.11/site-packages/openmm/../../../libOpenMM.so.8.0)

It can easily be fixed through conda by installing the right library:

conda install -c conda-forge libstdcxx-ng=12

Maybe it's worth to add a note to this in the README

[DaniBodor]

I found a different solution before looking at your comment here and added it to the README (see 45cc25a). Your solution is simpler though. Maybe I'll add another note to include both options, in case it doesn't work on all systems (I don't know how to test that).

[DaniBodor]

Next time, feel free to just make the adjustment rather than just opening an issue