Makefile是在Unix或者Linux中重要的生成可执行文件的方法，这是学习makefile的一个很好的例子，让你会很容易的在linux系统下生成你自己的可执行程序。-Makefile is an important way to generate an executable file Unix or Linux, this is a good example of learning makefile, so you can easily generate your own executable program in linux systems.