Kimtaro/gist:1779371

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    Getting the wordnet gem, version 0.0.5, working is a little tricky at the moment.
It's being rewritten but isn't released yet and the dbd gem is in a similar state.
These steps got it working for me on OS X Lion and MRI 1.8.7. On 1.9.2 convertdb.rb segfaults.
WordNet

Download WordNet from http://wordnet.princeton.edu/wordnet/download/current-version/
$ ./configure
$ make
$ make install

BerkeleyDB

This uses homebrew (http://mxcl.github.com/homebrew/).
If you use a different package manager then you will have to adjust the --with-db-dir below.
$ brew install berkeley-db

ruby-bdb gem

$ git clone https://github.com/knu/ruby-bdb
$ cd ruby-bdb
$ git checkout 6aa8054e022fa38055fd441de98b65fd392b8dcb
$ ruby extconf.rb --with-db-dir=/usr/local/Cellar/berkeley-db/5.1.19
$ make
$ make install

wordnet gem

$ gem install wordnet
$ gem which wordnet
$ cd your/wordnet/path
$ ruby convertdb.rb
$ mv ruby-wordnet/ `ruby -e "require 'rbconfig'; print Config::CONFIG['datadir']"`

Using it

$ irb
> require 'rubygems'
> require 'wordnet'
> lex = WordNet::Lexicon.new
> frog = lex.lookup_synsets('frog', WordNet::Noun)
> frog.first.hypernyms.first.overview
  => "amphibian [noun] -- (cold-blooded vertebrate typically living on land but breeding in water; aquatic larvae undergo metamorphosis into adult form)"