# File lib/ttk/strategies/PackageCollection.rb, line 14
      def prologue 
        super
        @dependencies = Pathname.new(@dependencies)
        @deps = YAML::load(@dependencies.read)
        @order = @deps.tsort_from(@target)
        @order.each do |dep|
          @symtbl["#{dep}_install_dir".to_sym] = "<<pwd>>/#{dep}"
          create(Import) do |t|
            t.name = dep
            t.import = "#{dep}.yml"
            t.symtbl[:configure_flags] =
              @deps[dep].map { |d| "--with-#{d}=<<pwd>>/#{d}" }.join(' ')
            t.fatal = true
          end
        end
      end