unless IO.respond_to? :binread
  require 'backports/tools'

  def IO.binread(file, *arg)
    raise ArgumentError, "wrong number of arguments (#{1+arg.size} for 1..3)" unless arg.size < 3
    File.open(Backports.convert_to_path(file),"rb") do |f|
      f.read(*arg)
    end
  end
end