[Rd] Makevars clean target not in action?

[Randy Lai]

Hi, developers

When I run `R CMD INSTALL --clean my_package`, only the .o files and the .so file are removed, however, they were deleted not because of the clean target defined in Makevars.
The clean target was indeed not executed.

I have the following simple Marvars to show that clean target is not functioning.

Makevars
-----------------------------

all: foo $(SHLIB)

clean: 
	rm -f *.o $(SHLIB)
	rm -f b

foo:
	touch b


After I run ``R CMD INSTALL --clean my_package``, the file `b` is still there.

Any thought?

Best,
Randy