def find_include_file(name)
      to_search = [ File.dirname(@input_file_name) ].concat @include_path
      to_search.each do |dir|
        full_name = File.join(dir, name)
        stat = File.stat(full_name) rescue next
        return full_name if stat.readable?
      end
      nil
    end
def find_include_file(name)
      to_search = [ File.dirname(@input_file_name) ].concat @include_path
      to_search.each do |dir|
        full_name = File.join(dir, name)
        stat = File.stat(full_name) rescue next
        return full_name if stat.readable?
      end
      nil
    end
Look for the given file in the directory containing the current
 file, and then in each of the directories specified in the
 RDOC_INCLUDE path