![]() ![]() ![]() If you decide that you don’t want to start with a clean install of macOS, then go through these instructions anyway. Migration Assistant takes care of restoring ordinary documents, which Apple does well, yet it provides a relatively blank slate under the hood to freshly install tools. Erase your working hard drive, install macOS, then have Migration Assistant import user accounts and applications from the backup ( but leave the Other Files & Folders box unchecked). Time Machine works spectacularly well for this purpose, or you can install onto a new hard drive or carbon copy your old drive. If you decide to do a clean installation, first make sure that you have a backup. But, as macOS and Homebrew have matured, I’m noticing less of a need to do this. I’ve ended up with multiple MySQL servers and multiple Apache servers. The dirty upgrade works great if you’re an everyday user who stays on the UI level, but in the distant past it made a terrific mess of my tools installed under the hood. Consider starting with a clean install of macOS. I haven’t been going back and re-testing these instructions on older macOS releases, so your mileage might vary if you do this. Over the years this post has been edited and updated to keep up with new versions, and new Homebrew formulae have been added and improved. I’ve tested these instruction on macOS 10.8 Mountain Lion, 10.9 Mavericks, 10.10 Yosemite, and 10.11 El Capitan when they were reasonably current. These tools used to break with each new version of macOS, although as it has matured, the disruptions with each new release have become less. For my research, I use Python, NumPy, SciPy, matplotlib, PyMC, and Basemap/geos, among other modules.
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