def have_rakefile # :nodoc:
      @rakefiles.each do |fn|
        if File.exist?(fn)
          others = FileList.glob(fn, File::FNM_CASEFOLD)
          return others.size == 1 ? others.first : fn
        elsif fn == ""
          return fn
        end
      end
      return nil
    end
def have_rakefile # :nodoc:
      @rakefiles.each do |fn|
        if File.exist?(fn)
          others = FileList.glob(fn, File::FNM_CASEFOLD)
          return others.size == 1 ? others.first : fn
        elsif fn == ""
          return fn
        end
      end
      return nil
    end
True if one of the files in RAKEFILES is in the current directory.
 If a match is found, it is copied into @rakefile.