I'm attempting to make a website with a few others for the first time, and have run into a weird error when trying to use Django/Python/VirtualEnv. I've found solutions to this problem for other operating systems, such as Ubuntu, but can't find any good solutions for Mac. This is the relevant code being run: virtualenv -p python3 venv source venv/bin/activate pip install -r requirements.txt After running that block, I get the following errors: AssertionError Failed building wheel for django-toolbelt Running setup.py bdist_wheel for psycopg2 ... AssertionError Failed building wheel for psycopg2 Failed to build django-toolbelt psycopg2 I believe I've installed the "django-toolbelt" and "psycopg2", so I'm not sure why it would be failing. The only difference I can think of is that I did not use the command sudo apt-get install libpq-dev as was instructed for Ubuntu usage as I believe that installing postgresql with brew took care of the header. Thanks for any help or insight! Continue reading...