def load(fn)
      lines = open(fn) {|mf| mf.read}
      lines.gsub!(/\\ /, SPACE_MARK)
      lines.gsub!(/#[^\n]*\n/m, "")
      lines.gsub!(/\\\n/, ' ')
      lines.each_line do |line|
        process_line(line)
      end
    end
def load(fn)
      lines = open(fn) {|mf| mf.read}
      lines.gsub!(/\\ /, SPACE_MARK)
      lines.gsub!(/#[^\n]*\n/m, "")
      lines.gsub!(/\\\n/, ' ')
      lines.each_line do |line|
        process_line(line)
      end
    end
Load the makefile dependencies in +fn+.