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add_dependency 

        # Gem::Specification.add_dependency

(from ruby core)
### Implementation from Specification
---
    add_dependency(gem, *requirements)

---

(This method is an alias for Gem::Specification#add_runtime_dependency.)

Adds a runtime dependency named `gem` with `requirements` to this gem.

Usage:

    spec.add_runtime_dependency 'example', '~> 1.1', '>= 1.1.4'

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