How to do a domain specific install?

This explains how to run a custom install of Ruby, but it seems this would go into effect for all hosted domains. If I want to use a different version for a specific domain, how would I go about installing two separate versions of Ruby and configuring the domains for the one they require?

Easiest way would be to set up a new username and install the custom version of ruby on that. You can then register the domain you want to use the custom install with to the new user account.

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