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4.5 Searching Directories for Prerequisites =========================================== For large systems, it is often desirable to put sources in a separate directory from the binaries. The "directory search" features of `make' facilitate this by searching several directories automatically to find a prerequisite. When you redistribute the files among directories, you do not need to change the individual rules, just the search paths.
4.5 为前提条件搜索目录
对大型系统而言，经常是有目的的把源程序目录和二进制目录分开。
make 的目录搜索功能通过自动搜索几个目录以找到前提条件。当你重新在目录间分发文件时，你不需要改变具体的规则，只需要设置搜索路径。
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