I have an OS X 10.13 system, on which a custom app runs fine. I created a brand new VM with OS X 10.13, and the app doesn't run - it has issues with dependencies (probably some MacPorts thing). What is the simplest way to get a copy of my OS X 10.13 system into a VM? I don't want to bring my user files - only the OS and MacPorts installs, and I want it to be as small as possible on disk. I could run Migration Assistant in the existing VM and try to target the working machine? Or, can I just make a new VM that's a copy of my 10.13 machine minus the user files?