のでメモしておくだけ。 Fetching: rdoc-3.12.2.gem (100%) Depending on your version of ruby, you may need to install ruby rdoc/ri data: <= 1.8.6 : unsupported = 1.8.7 : gem install rdoc-data; rdoc-data --install = 1.9.1 : gem install rdoc-da…