Build with MRI Ruby 2.2.x
| Use Flag | Description |
|---|---|
| ruby_targets_ruby21 | Build with MRI Ruby 2.1.x |
| ruby_targets_ruby25 | Build with MRI Ruby 2.5.x |
| ruby_targets_ruby26 | Build with MRI Ruby 2.6.x |
| ruby_targets_ruby24 | Build with MRI Ruby 2.4.x |
| ruby_targets_ruby23 | Build with MRI Ruby 2.3.x |
| ruby_targets_rbx | Build with Rubinius |
| ruby_targets_ruby22 | Build with MRI Ruby 2.2.x |