Error message installing the feedtools gem.

[Leray Raphael]

I'm currently studying Ruby with the book : "Beginning Ruby, from novice
to professional" and I'm having a problem with the installation of the
"feedtools" gem.

When I do this =>
sudo gem install feedtools

I got this =>
ERROR: Error installing feedtools:
activemodel requires builder (~> 2.1.2, runtime)

I tried to install a gem named "builder" and it worked fine, but I still
got the same error message.
I'm on Ubuntu 10.04 LTS and ruby 1.8.7 (2010-01-10 patchlevel 249).

Any help or advice would be appreciated.
Thanks in advance.

 

[Abiff Hiram]

I'm responding to myself :

sudo gem install builder -v=2.1.2

sudo gem install feedtools --no-rdoc --no-ri

Hope it'll be useful to somebody.