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module OS
	def OS.windows?
		(/cygwin|mswin|mingw|bccwin|wince|emx/ =~ RUBY_PLATFORM) != nil
	end

	def OS.mac?
	 (/darwin/ =~ RUBY_PLATFORM) != nil
	end

	def OS.unix?
		!OS.windows?
	end

	def OS.linux?
		OS.unix? and not OS.mac?
	end
end