module FileUtils

def safe_ln(*args, **options)

fails.
Attempt to do a normal file link, but fall back to a copy if the link 
def safe_ln(*args, **options)
  if LN_SUPPORTED[0]
    begin
      return options.empty? ? ln(*args) : ln(*args, **options)
    rescue StandardError, NotImplementedError
      LN_SUPPORTED[0] = false
    end
  end
  options.empty? ? cp(*args) : cp(*args, **options)
end