|GNU Make Manual||www.imodulo.com · 2003-04-05|
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If the environment variable
MAKEFILES is defined,
make considers its value as a list of names (separated by whitespace) of additional makefiles to be read before the others. This works much like the
include directive: various directories are searched for those files (Including Other Makefiles). In addition, the default goal is never taken from one of these makefiles and it is not an error if the files listed in
MAKEFILES are not found.
The main use of
MAKEFILES is in communication between recursive invocations of
make (Recursive Use of
make). It usually is not desirable to set the environment variable before a top-level invocation of
make, because it is usually better not to mess with a makefile from outside. However, if you are running
make without a specific makefile, a makefile in
MAKEFILES can do useful things to help the built-in implicit rules work better, such as defining search paths (Directory Search).
Some users are tempted to set
MAKEFILES in the environment automatically on login, and program makefiles to expect this to be done. This is a very bad idea, because such makefiles will fail to work if run by anyone else. It is much better to write explicit
include directives in the makefiles. Including Other Makefiles.
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