tomz / libsvm-ruby-swig

Would it be possible to get a listing of requirements and/or detailed usage of this interface?

I am trying to install on Mac OS. I installed libsvm via macports, and installation seems to be fine.
However, when I require 'svm', I get the following error and stack trace:

  LoadError: dlopen(/Library/Ruby/Gems/1.8/gems/tomz-libsvm-ruby-swig-0.3.3/ext/libsvm.bundle, 9): Symbol not found: __ZTVN10__cxxabiv117__class_type_infoE
    Referenced from: /Library/Ruby/Gems/1.8/gems/tomz-libsvm-ruby-swig-0.3.3/ext/libsvm.bundle
    Expected in: dynamic lookup
   - /Library/Ruby/Gems/1.8/gems/tomz-libsvm-ruby-swig-0.3.3/ext/libsvm.bundle
    from /Library/Ruby/Gems/1.8/gems/tomz-libsvm-ruby-swig-0.3.3/ext/libsvm.bundle
    from /Library/Ruby/Site/1.8/rubygems/custom_require.rb:31:in `require'
    from /Library/Ruby/Gems/1.8/gems/tomz-libsvm-ruby-swig-0.3.3/lib/svm.rb:1
    from /Library/Ruby/Site/1.8/rubygems/custom_require.rb:36:in `gem_original_require'
    from /Library/Ruby/Site/1.8/rubygems/custom_require.rb:36:in `require'
    from (irb):1

Any help or ideas around this would be most appreciated!

Thanks,
-Harold