Error with python3-saml on Anvil: lxml & xmlsec libxml2 library version mismatch

[sun.developer_anvil2]

Hi everyone,

I’m trying to use python3-saml in the Anvil Editor, but I’m encountering this error when running my app:
InternalError: (-1, 'lxml & xmlsec libxml2 library version mismatch')

According to the installation note on the GitHub repo:

GitHub - SAML-Toolkits/python-saml: Python SAML Toolkit

this issue can be fixed by running:
pip install --force-reinstall --no-binary lxml lxml

So, I added that command to the post-install script in Anvil. However, the build process takes too long and eventually times out, even after several attempts.

Has anyone encountered this before? Any suggestions for how to successfully install python3-saml with compatible lxml and libxml2 versions on Anvil?

Thanks in advance!