Installing Standard Ruby Classes Documentation with rdoc3

What is the correct procedure to have the standard Ruby class documentation available via the "ri" system? I know about the rdoc-data gem, but is that still a开发者_JAVA百科ppropriate for the rdoc3 (3.0.1) gem?

Ruby 1.8.7/Linux (OS) specific if possible.

Thank you.

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I ended up installing the rdoc-data gem and ran:

rdoc-data --install

(after creating /usr/share/ri) and it all seems to work. It would be nice if there was a way to install the documentation to somewhere other than /usr/share/ri but at least the docs are available.