Issue
In Ubuntu 20.04 & Python 3.8.12, I faced an error like this:

error: command 'gcc' failed: No such file or directory

ERROR: Failed building wheel for ciso8601
Successfully built antlr4-python3-runtime
Failed to build ciso8601
ERROR: Could not build wheels for ciso8601 which use PEP 517 and cannot be installed directly

Potential alternative/fix
Ubuntu/Debian users can fix this error with
apt-get update && apt-get install -y python3-dev python3-pip python3-venv python3-wheel