Update MacOS to Catalina or Mojave for least problems with Stan-based software?

Hi @admaths, sorry you’re running into installation trouble. It’s definitely fine to respond here but I think in this case if you create a new post that will help get more eyes on it. If you do that can you share the error messages you’re getting? If it lets you paste all several hundred lines in the post that’s fine, otherwise maybe just the start and end of the messages will be enough for us to figure it out. And can you also share the contents of your Makevars file? You can check that with

file.edit(file.path(Sys.getenv("HOME"), ".R", "Makevars"))