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Adding alternate Ruby installs to DevKit with pik

Actually, pik doesn't have anything to do it, but you'd need pik to manage multiple Ruby installs on Windows, so it's probably in the picture.

There's a pik command that mentions DevKit, but for whatever reason it's not really documented.

That's ok, because you don't need it. Instead, just go to your DevKit directory and edit the file config.yml. Add your Ruby's path on its own line at the end of the file, matching the format of the line above it.

Then go to a command-line and run ruby dk.rb install. That should be it.