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!include
--------
This directive is like the #include preprocessor directive for the C
or C++ language--it lets you include the text of another file in the
makefile:

  !include <filename>

You can enclose <filename> in quotation marks ("") or angle brackets
(<>) and nest directives to unlimited depth, but writing duplicate
!include directives in a makefile isn't permitted--you'll get the
error message "cycle in the include file".

Rules, commands, or directives must be complete within a single source
file; you can't start a command in an !include file, then finish it in
the makefile.

MAKE searches for !include files in the current directory unless
you've specified another directory with the -I option.