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

[Paul D. Smith]

Update of bug #47880 (project make):

        Operating System:              MS Windows => Any                    
                 Summary: [Win] added MAKELIBPATH as default include directory
=> Allow updates to .INCLUDE_DIRS to change search path

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Follow-up Comment #1:

There is no need to add a new environment variable for this.  The MAKEFLAGS
variable already exists, and you can just add -I options into it which will be
parsed as if you'd entered it on the command line.  Also it's already possible
when building GNU make on Windows to set the INCLUDEDIR preprocessor variable
to add a new default pathname to GNU make: this just isn't done by default
because there's no good choice for what it should be.

I've retargeted this issue as a generic enhancement to allow setting the
.INCLUDE_DIRS variable to change the search path.

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