'rvm gem' - Working with rubygems for rubies

\~/projects/ruby/extlib [git:master] ∴ rvm 1.8.6,1.9.1 gem install rspec json --no-rdoc --no-ri

ruby-1.8.6-p383: ruby 1.8.6 (2009-08-04 patchlevel 383) [i686-darwin10.0.0]
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Thank you for installing rspec-1.2.8

Please be sure to read History.rdoc and Upgrade.rdoc
for useful information about this release.

**************************************************
Successfully installed rspec-1.2.8
Building native extensions.  This could take a while...
Successfully installed json-1.1.9
2 gems installed

ruby-1.9.1-p243: ruby 1.9.1p243 (2009-07-16 revision 24175) [i386-darwin10.0.0]
**************************************************

Thank you for installing rspec-1.2.8

Please be sure to read History.rdoc and Upgrade.rdoc
for useful information about this release.

**************************************************
Successfully installed rspec-1.2.8
Building native extensions.  This could take a while...
Successfully installed json-1.1.9
2 gems installed