In virtual environment I'm trying to install apache-airflow. macOS: 10.13.6 Python: 3.9
(airflow_venv) $ sudo -H pip install apache-airflow==1.10.12 --constraint "https://raw.githubusercontent.com/apache/airflow/constraints-1.10.12/constraints-3.7.txt
after installing quite some other wheels, for pandas I get the following error -
ERROR: Could not build wheels for pandas which use PEP 517 and cannot be installed directly
I've tried updating wheel and pip.