calcengine

Yes you're right! There was something wrong with poetry build system. When I initialised the poetry project roughly a year ago it placed an unpinned dependency (for the build part) for cryptography which recently switched to rust. I'm not sure why poetry hadn't vendorized that package or, at least, pinned the version. In any case, I updated the repo's pyproject.toml to use poetry's new build settings. Then, to check the install works in docker I switched to python's base images and did the following: docker run -it --rm python:latest /bin/bash curl -sSL https://raw.githubusercontent.com/python-poetry/poetry/master/get-poetry.py | python - cd /tmp git clone https://github.com/bsdz/calcengine.git cd calcengine python3 -mvenv --prompt calceng .venv . ./.venv/bin/activate pip install "cppy>=1.1.0" ~/.poetry/bin/poetry instal

Here is how to reproduce it in a fresh docker container, so we have the same environment: docker run -it --rm debian:10-slim /bin/bash apt update apt install -y git python3-pip --no-install-recommends pip3 install git+https://github.com/bsdz/calcengine.git#master Result: "This package requires Rust >=1.41.0."

Good spot. You can actually just run the following if you don't want to use poetry. pip install git+https://github.com/bsdz/calcengine.git#master Unfortunately, this will only install the core library without the demo spreadsheet files. Even if you were to add the extras modifier "[demo]", it would only install additional dependencies and not the actual demo code. To use the demo you'll need to clone and follow instructions in my other comment.