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Ruby

How to add database (activerecord, sqlite3 or mysql) on Sinatra framework?

I would like to know the minimum setup to do it to keep Sinatra with minimal setting. I think you need to add some gems in gemfile and run bundler to install them, and so on. But I am not sure what exactly I have to do to do it. Do I have to use Linux server to do it? Can I do with Mac?