CentOS 6.4でとのpryを動かそうとしたらReadlineがないエラーになった。
$ pry Sorry, you can't use Pry without Readline or a compatible library. Possible solutions: * Rebuild Ruby with Readline support using `--with-readline` * Use the rb-readline gem, which is a pure-Ruby port of Readline * Use the pry-coolline gem, a pure-ruby alternative to Readline