ruby2.1 2.1.5-4ubuntu1 (amd64 binary) in ubuntu wily

 Ruby is the interpreted scripting language for quick and easy
 object-oriented programming. It has many features to process text
 files and to do system management tasks (as in perl). It is simple,
 straight-forward, and extensible.
 .
 In the name of this package, `2.1' indicates the Ruby library compatibility
 version. This package currently provides the `2.1.x' branch of Ruby.