I am installing firedrake on my new laptop from scratch (running macOS Sierra). 

The installation script runs and installs virtualenv, up to the point where I get this:

Virtual env installed. Please run firedrake-install again.

But when I run

python firedrake-install

again, it just does the same thing (similar to the previous step) and does not install firedrake (and petsc etc..). What shall I do?

Best, Anna.