Ghislain MARY wrote:

>$ gem install actionmailer
>Attempting local installation of 'actionmailer'
>Local gem file not found: actionmailer*.gem
>Attempting remote installation of 'actionmailer'
>/usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:26:in `require': No 
>such file to load -- action_controller (LoadError)
>  
>

The 'action_controller' section suggests that it may have something to 
do with the install of one of the Rails dependencies.  Instead of doing 
the components separately, try executing 'gem install rails' and answer 
'y'es to the dependencies.