Cannot build FASTAPI python server

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My code works locally - but does not work on render.
Its a fastapi based python server - and I get the following error during the deploy / pip install process.

PLEASE HELP
creating build/temp.linux-x86_64-cpython-311/lib

Aug 5 12:13:43 AM gcc -pthread -Wsign-compare -DNDEBUG -g -fwrapv -O3 -Wall -fPIC -I/opt/render/project/src/.venv/include -I/usr/local/include/python3.11 -c lib/zoneinfo_module.c -o build/temp.linux-x86_64-cpython-311/lib/zoneinfo_module.o -std=c99

Aug 5 12:13:43 AM lib/zoneinfo_module.c: In function ‘zoneinfo_fromutc’:

Aug 5 12:13:43 AM lib/zoneinfo_module.c:600:19: error: ‘_PyLong_One’ undeclared (first use in this function); did you mean ‘_PyLong_New’?

Aug 5 12:13:43 AM one = _PyLong_One;

Aug 5 12:13:43 AM ^~~~~~~~~~~

Aug 5 12:13:43 AM _PyLong_New

Aug 5 12:13:43 AM lib/zoneinfo_module.c:600:19: note: each undeclared identifier is reported only once for each function it appears in

Aug 5 12:13:43 AM error: command ‘/usr/bin/gcc’ failed with exit code 1

Aug 5 12:13:43 AM [end of output]

Aug 5 12:13:43 AM

Aug 5 12:13:43 AM note: This error originates from a subprocess, and is likely not a problem with pip.

Aug 5 12:13:43 AM ERROR: Failed building wheel for backports.zoneinfo

Aug 5 12:13:43 AM Building wheel for Flask-JWT (pyproject.toml): started

Aug 5 12:13:43 AM Building wheel for Flask-JWT (pyproject.toml): finished with status ‘done’

Failed to build backports.zoneinfo

Aug 5 12:14:12 AMERROR: Could not build wheels for backports.zoneinfo, which is required to install pyproject.toml-based projects

Aug 5 12:14:12 AM

There will always be differences between environments: development mode/Local, production mode/Render, OS, versions, resources, etc. These differences need to be considered and configured as required for your own app in each environment.

A quick search for the error “Could not build wheels for backports.zoneinfo”, brings up this Stack Overflow post: https://stackoverflow.com/questions/71712258/error-could-not-build-wheels-for-backports-zoneinfo-which-is-required-to-insta

That seems to suggest that the Python version may be the issue. Render’s current Python default is 3.11.9 . Maybe try setting the Python version to the same one you developed/tested.