[bug #47880] Allow updates to .INCLUDE_DIRS to change search path

[Dmitry Goncharov]

Follow-up Comment #5, bug #47880 (project make):

> The problem is that MAKEFLAGS is only parsed once before all makefiles are
read, and again after all makefiles are read.

So, this all boils down to having make consider changes to MAKEFLAGS
immediately.


> I was hoping to avoid adding a new command line switch.

Well, even with MAKEFLAGS having immediate effect there needs to be a
mechanism to remove the default directories.
Another option is to remove the default directories from make. Is there a
makefile that includes anything from /usr/include or /usr/local/include or
/usr/gnu/include?


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