$ sudo apt-get install mecab libmecab-dev $ wget http://jaist.dl.sourceforge.net/sourceforge/mecab/mecab-ruby-0.98.tar.gz $ tar zxvf mecab-ruby-0.98.tar.gz $ cd mecab-ruby-0.98 $ gem build mecab-ruby.gemspec $ sudo gem install mecab-ruby-0.97.gem libmecab-dev 入れてなくてはまった