[BioRuby] Missing libxml-ruby and unit tests on Mac OS X Snow Leopard

[Naohisa Goto]

Hi Peter,

> $ export GEM_HOME=$HOME/.gem
> $ export $HOME/.gem:$HOME/.gem/ruby/1.8/gems
> $ export PATH=$PATH:$HOME/.gem/ruby/1.8/gems/:$HOME/.gem/ruby/1.8/gems/libxml-ruby-2.2.2/ext/libxml/
> $ ruby test/runner.rb

In Ruby 1.8, Rubygems is an optional software and it is not loaded by
default. Please try
 $ ruby -rubygems test/runner.rb
or set RUBYOPT environment variable
 $ export RUBYOPT=-rubygems

After Ruby 1.9, Rubygems is bundled within Ruby and libraries installed
by using Rubygems are ready by default without -rubygems.
-- 
Naohisa Goto
ngoto at gen-info.osaka-u.ac.jp / ng at bioruby.org