ERROR: RDoc documentation generator not installed: no such file to load -- rdoc/rdoc

I recently setup a new server with Ruby and Rubygems however I received an error when attempting to install my first gem which happened to be ruby-lsapi. Below I explain the error including an example of the error in the output of installing a gem as well as what was done to resolve the error.

RDoc Error Installing Ruby Gem On CentOS Linux:

[root@dev rubygems-1.3.7]# gem install ruby-lsapi
Building native extensions. This could take a while...
Successfully installed ruby-lsapi-4.0
1 gem installed
ERROR: While executing gem ... (Gem::DocumentError)
ERROR: RDoc documentation generator not installed: no such file to load -- rdoc/rdoc
[root@dev rubygems-1.3.7]#

While the gem actually installed the documentation did not so it is an issue that should be resolved in case you ever need the documentation of a gem you are installing. Resolving this problem is done by installing the ruby-rdoc package which will have a dependency of ruby-irb. As you can see below the install is quick and can be completed by Yum depending on what repositories you have installed.

Install ruby-rdoc On CentOS Linux Via Yum:

[root@dev ~]# yum install ruby-rdoc
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* addons: mirrors.xmission.com
* base: centos.mirror.facebook.net
* extras: mirrors.netdna.com
* updates: mirrors.versaweb.com
Setting up Install Process
Resolving Dependencies
--> Running transaction check
---> Package ruby-rdoc.i686 0:1.8.6.111-1 set to be updated
--> Processing Dependency: ruby-irb = 1.8.6.111-1 for package: ruby-rdoc
--> Running transaction check
---> Package ruby-irb.i686 0:1.8.6.111-1 set to be updated
--> Finished Dependency Resolution
Dependencies Resolved
====================================================================================================================================
Package Arch Version Repository Size
====================================================================================================================================
Installing:
ruby-rdoc i686 1.8.6.111-1 ruby 137 k
Installing for dependencies:
ruby-irb i686 1.8.6.111-1 ruby 70 k
Transaction Summary
====================================================================================================================================
Install 2 Package(s)
Upgrade 0 Package(s)
Total download size: 206 k
Is this ok [y/N]: y
Downloading Packages:
(1/2): ruby-irb-1.8.6.111-1.i686.rpm | 70 kB 00:00
(2/2): ruby-rdoc-1.8.6.111-1.i686.rpm | 137 kB 00:00
------------------------------------------------------------------------------------------------------------------------------------
Total 91 kB/s | 206 kB 00:02
Running rpm_check_debug
Running Transaction Test
Finished Transaction Test
Transaction Test Succeeded
Running Transaction
Installing : ruby-irb 1/2
Installing : ruby-rdoc 2/2
Installed:
ruby-rdoc.i686 0:1.8.6.111-1
Dependency Installed:
ruby-irb.i686 0:1.8.6.111-1
Complete!
[root@dev ~]#