Ruby mXML error

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I received this error on my Mac OSX 10.5

After using Mac Ports to install Ruby, and then installing Ruby gems 1.3.3, I received this error when installing rubyosa.

<geshi lang="bash"> $ sudo gem install rubyosa Building native extensions. This could take a while... Building native extensions. This could take a while... Successfully installed libxml-ruby-1.1.3 Successfully installed rubyosa-0.4.0 2 gems installed Installing ri documentation for libxml-ruby-1.1.3...

Enclosing class/module 'mLibXML' for module XML not known

Enclosing class/module 'mXML' for class Attr not known

Enclosing class/module 'mXML' for class AttrDecl not known

Enclosing class/module 'mXML' for class Attributes not known

Enclosing class/module 'mXML' for class Document not known </geshi>

Attempting a sudo port upgrade all...

Oops.. never do sudo port upgrade all. Rather, I needed to sudo port selfupdate and sudo port upgrade outdated.