# File lib/guard/listeners/darwin.rb, line 32
    def self.usable?
      require 'rb-fsevent'
      if !defined?(FSEvent::VERSION) || (defined?(Gem::Version) &&
          Gem::Version.new(FSEvent::VERSION) < Gem::Version.new('0.4.0'))
        UI.info 'Please update rb-fsevent (>= 0.4.0)'
        false
      else
        true
      end
    rescue LoadError
      UI.info 'Please install rb-fsevent gem for Mac OSX FSEvents support'
      false
    end