Install a gem for just ruby 1.9.2?

How do I specify for what version of ruby I would like to开发者_如何学Go install a gem in?

Are you using RVM? If so, just go to you ruby:

rvm 1.9.2-head

then do

gem install whatever

use RVM. This is a good tutorial.

Do focus on creating gemset

Are you not using RVM?

$> rvm use 1.9.2 
$> gem install <gem name>

The gem will be installed only for Ruby 1.9.2

You need to use RVM, that way you can manage what gems are installed for what ruby/rails.