"gem install rails --include-dependenceies" create RDoc stage takes over 7 hours

[DavidElentok]

I ran "gem install rails --include-dependencies",
when it reached the "Installing RDoc documentation for builder-3.0.0..." stage
the hard drive was working constantly, and it kept working the entire night, until I killed it,
it hanged my whole system, so it took me about 5 minutes until I could actually kill the process,

the same thing happened on my laptop, at the same exact point (Installing RDoc documentation for builder-3.0.0) with the same exact process.

See the attachment for the entire RoR installating log.

Basically, this is what I did:
$ sudo apt-get install build-essential libopenssl-ruby libfcgi-dev ruby irb rubygems ruby1.8-dev sqlite3 libsqlite3-dev libmysql-ruby libmysqlclient-dev
$ sudo gem install rubygems-update
$ sudo gem install rails --include-dependencies

[DavidElentok (3david)]

A little more information:

- This happened on two systems:
  1. an i5 760 (quad core) with 4gb ram
  2. asus u35jc with i5 380m with 4gb ram

- Both running:
  - Ubuntu 11.10 64-bit with Unity desktop
  - ruby-1.8.7 (2011-06-30 patchlevel 352) [x86_64-linux]
  - gem 1.7.2