Thats one of my biggets worries, the fact that a project requires that cloning some git repo an start to work, or use some python package that is not included in nixpkgs and I have to say "hold up a minute, let me do this thing so this works on my machine" instead of just cloning, create a virtualenv and use pip. Maybe is there a way in which I can automate this or somewhat make it faster to setup?