Add system-wide library after installation of Firedrake

[Alpha-Legion]

I installed Firedrake following the basic instructions of the Documentation.
But when I tried to run the first example of the tutorial, it tells me that I need extra libraries such as matplotlib and vtk.
Since these are popular libraries that I would use outside the environment of Firedrake, I want to install them as system-wide libraries.
So, what should I do? Do I need to remove and reinstall Firedrake from the beginning after the system-wide libraries are installed? Or can I do some very simple things to allow Firedrake to use external libraries? How to do that? Is there any risk?

[dham]

As with your previous question, this one goes to how Python works rather than Firedrake. If you are using a virtual environment then this creates an isolated Python and you need to install any packages you need in there. Compared to PETSc, they're all going to be small so there is no real cost to having multiple copies of Python packages in different virtual environments on your system.

[Alpha-Legion]

Thanks!