Thus, environment variables are used only if a variable is not set in any makefile or on the command line. Note: parent makefile variables are sometimes, but not always, passed down.

因此，一个变量只有在没有在任何makefile或命令行中指定时，才会使用环境变量的设置注意：父进程makefile变量有时候会传递下来，但不总会这样。

youdao

With these installed, you need to edit the supplied makefile, usually contained in /var/yp/Makefile.

安装了这些程序包后，需要对所提供的 makefile 进行编辑，该文件通常位于 /var/yp/Makefile 中。

youdao

Each component has its own Makefile, and the top level Makefile walks through each of its sub-directories building all Makefiles it finds.

每个组件有它自己的Makefile，并且顶级Makefile遍历它所有的子目录构建它所找到的所有Makefile。

youdao

> Good question, so we didn't have a Makefile yet, more on that in the future.

>好问题，我们还没有一个Makefile文件，更多精彩，尽在以后的课程。

哈佛公开课 - 计算机科学课程节选

> What's the difference between a compiler and a Makefile?

>，编译器和Makefile有什么区别？

哈佛公开课 - 计算机科学课程节选

> Before we had the Makefile?

>，在Makefile之前吗？

哈佛公开课 - 计算机科学课程节选