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platform= 

        # Gem::Specification.platform=

(from ruby core)
### Implementation from Specification
---
    platform=(platform)

---

The platform this gem runs on.

This is usually Gem::Platform::RUBY or Gem::Platform::CURRENT.

Most gems contain pure Ruby code; they should simply leave the default
value in place.  Some gems contain C (or other) code to be compiled into
a Ruby "extension".  The gem should leave the default value in place
unless the code will only compile on a certain type of system.  Some
gems consist of pre-compiled code ("binary gems").  It's especially
important that they set the platform attribute appropriately.  A
shortcut is to set the platform to Gem::Platform::CURRENT, which will
cause the gem builder to set the platform to the appropriate value for
the system on which the build is being performed.

If this attribute is set to a non-default value, it will be included in
the filename of the gem when it is built such as:
nokogiri-1.6.0-x86-mingw32.gem

Usage:

    spec.platform = Gem::Platform.local

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