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。
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。
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。
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。
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