Thank you, I installed CMake. My terminal still tells me -bash: cmake: command not found but I was able to open CMake as an application, select the build and source folders and build root (some elements are not ticked however – see image, I don’t know if this is normal).
I don’t know how to implement step 5 of https://root.cern.ch/building-root, and when I try to start Root (step 7), it tells me -bash: root: command not found.
At this point I have no idea of what I should try to do…