3.3 Including Other Makefiles
=============================
The `include' directive tells `make' to suspend reading the current
makefile and read one or more other makefiles before continuing. The
directive is a line in the makefile that looks like this:
FILENAMES can contain shell file name patterns. If FILENAMES is empty,
nothing is included and no error is printed.
include 指令告诉 make 暂时停止阅读当前的 makefile，然后阅读一个或更多的其他的makefile。
FILENAMES 可以包含 shell 文件名称模式。如果FILENAMES 是空，那么将不会包含任何文件，也不会报错。
本文转自健哥的数据花园博客园博客，原文链接http://www.cnblogs.com/gaojian/archive/2012/09/14/2684438.html，如需转载请自行联系原作者