# File lib/rb-kqueue/native/flags.rb, line 106
      def self.from_flag(prefix, flag)
        re = /^#{Regexp.quote prefix}_/
        constants.each do |sym|
          c = sym.to_s
          next unless c =~ re
          return c.to_s.sub("#{prefix}_", "").downcase.to_sym if const_get(c) == flag
        end
      end