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Using MAKE macros
=================
A MAKE macro is a string that is expanded (used) wherever the macro is
called in a makefile. Macros let you create template makefiles that
you can change to suit different projects. For example, to define a
macro called LIBNAME that represents the string "mylib.lib," type
"LIBNAME = mylib.lib". When MAKE encounters the macro "$(LIBNAME)", it
uses the string "mylib.lib".

If MAKE finds an undefined macro in a makefile, it looks for an
operating-system environment variable of that name (usually defined
with SET) and uses its definition as the expansion text. For example,
if you wrote "$(path)" in a makefile and never defined "path", MAKE would
use the text you defined for PATH in your AUTOEXEC.BAT. (See the
manuals for your operating system for information on defining
environment variables.)