Problem installing www/rubygem-rails

[Sergey Chernikov]

	Hi,

When trying to upgrade or install rails from scratch I get the following 
error:
...
Successfully installed rails-3.0.0
1 gem installed
Installing RDoc documentation for rails-3.0.0...
File not found: lib
*** Error code 1

Stop in /usr/ports/www/rubygem-rails.
*** Error code 1

Stop in /usr/ports/www/rubygem-rails.

How can I skip RDoc installation to workaround this error?
Thanks in advance.

-- 
sc