Gem::PlatformMismatch

        # Gem::PlatformMismatch < Gem::ErrorReason

(from ruby core)
---
Generated when trying to lookup a gem to indicate that the gem was
found, but that it isn't usable on the current platform.

fetch and install read these and report them to the user to aid in
figuring out why a gem couldn't be installed.
---
# Class methods:

    new

# Instance methods:

    add_platform
    name
    platforms
    version
    wordy

# Attributes:

    attr_reader name
    attr_reader platforms
    attr_reader version