changing MAKEFLAGS to affect current makefile

[Boris Kolpackov]

Good day,

I read the following in "Communicating Options to sub-make":

"You can also set `MAKEFLAGS' in a makefile, to specify additional 
flags that should also be in effect for that makefile."

and also

"When `make' interprets the value of `MAKEFLAGS' (either from the
environment or from a makefile), it first prepends a hyphen if the 
value does not already begin with one."

Which means that I should be able to say something like


MAKEFLAGS += -r

and all built-in implicit rules are gone. But that sounds too 
good to be true - this line has no effect on current make.
 
Any clue?


thanks,
-boris

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