Trouble installing with spack

[sampotter]

Trying to use meshpy on a cluster with spack.

After installing spack, I install and load several standard and necessary packages: gcc, python, py-pip, etc. Just the default version of each that is available.

Using spack's version of pip, I install pybind11. Then I clone meshpy from GitHub and try to install it. This seems to work, at least initially. Using, e.g., python setup.py install --user or pip install . leads to the same error. Namely (encountered while trying to import meshpy.triangle as triangle):

In [1]: import meshpy._internals
---------------------------------------------------------------------------
ImportError                               Traceback (most recent call last)
<ipython-input-1-4f0d2eb1fac4> in <module>
----> 1 import meshpy._internals

ImportError: /home/sfp8544/.local/lib/python3.9/site-packages/MeshPy-2020.1-py3.9-linux-x86_64.egg/meshpy/_internals.cpython-39-x86_64-linux-gnu.so: undefined symbol: _ZNSt15__exception_ptr13exception_ptr10_M_releaseEv

Looks like the C++ standard library isn't getting linked. Presumably this is because of some version mismatch along the way. Any thoughts?