# Problem installing rdoc

**URL:** <https://www.ruby-forum.com/t/problem-installing-rdoc/184236>\
**Category:** Ruby\
**Created:** [February 27, 2010, 12:04am UTC](https://www.ruby-forum.com/t/problem-installing-rdoc/184236 "2010-02-27T00:04:58Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![ashita](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/2bfe46/32.png) [@ashita](https://www.ruby-forum.com/u/ashita)\
**Post date:** [February 27, 2010, 12:04am UTC](https://www.ruby-forum.com/t/problem-installing-rdoc/184236/1 "2010-02-27T00:04:58Z")

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Hello Group,

ruby version: ruby 1.9.1p378

I used the commands presented below to install rdoc.

gem install rdoc  
gem rdoc --all

However, I was not able to load rdoc/usage

irb(main):001:0\> require ‘rdoc/usage’  
LoadError: no such file to load – rdoc/usage  
from (irb):1:in `require' from (irb):1 from /usr/bin/irb:12:in`’

Is there anything else that needs to be installed using gem?

Regards,  
Ashita

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<div class="post-metadata">

**Author:** ![ashita](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/2bfe46/32.png) [@ashita](https://www.ruby-forum.com/u/ashita)\
**Post date:** [February 27, 2010, 3:06am UTC](https://www.ruby-forum.com/t/problem-installing-rdoc/184236/2 "2010-02-27T03:06:49Z")

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On Feb 27, 12:05 am, Ashita H. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote:

> irb(main):001:0\> require ‘rdoc/usage’  
> LoadError: no such file to load – rdoc/usage  
> from (irb):1:in `require' from (irb):1 from /usr/bin/irb:12:in `’
> 
> Is there anything else that needs to be installed using gem?

Did you tried first:

require ‘rubygems’  
require ‘rdoc/usage’

?

As you installed RDoc as a gem, you first must require rubygems in  
order to allow ‘require’ find it.

You can avoid doing it every time setting the environment variable  
RUBYOPT=rubygems