```ruby
MRuby::Gem::Specification.new('mruby-rational') do |spec|
  spec.license = 'MIT'
  spec.author  = 'dyama'
  spec.summary = 'Rational class'

  spec.add_test_dependency('mruby-enum-ext')
end
```

Add dependency to mruby-metaprog. (for mruby-2.0.0)
user
```ruby
MRuby::Gem::Specification.new('mruby-rational') do |spec|
  spec.license = 'MIT'
  spec.author  = 'dyama'
  spec.summary = 'Rational class'

  spec.add_dependency('mruby-metaprog')
  spec.add_test_dependency('mruby-enum-ext')
end
```
assistant