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requirements 

        # Gem::Specification.requirements

(from ruby core)
### Implementation from Specification
---
    requirements()

---

Lists the external (to RubyGems) requirements that must be met for this
gem to work.  It's simply information for the user.

Usage:

    spec.requirements << 'libmagick, v6.0'
    spec.requirements << 'A good graphics card'

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