https://integration.wikimedia.org/ci/job/wikimedia-toolhub-pipeline-test/620/console
Building wheels for collected packages: cryptography Running setup.py bdist_wheel for cryptography: started Running setup.py bdist_wheel for cryptography: finished with status 'error' [...snip...] generating cffi module 'build/temp.linux-x86_64-3.7/_openssl.c' running build_rust [...snip...] error: Can not find Rust compiler
https://cryptography.io/en/latest/installation.html#rust
Building cryptography requires having a working Rust toolchain. The current minimum supported Rust version is 1.45.0. This is newer than the Rust most package managers ship, so users will likely need to install with the instructions below.