Combining "auto dependency generation" with "Target specific variable values"

[mwnn]

Hi all,
   The "Auto dependecy generation" mechanism can be used to generation 
dependency list for a target automatically. For a C file this can be 
done by invoking gcc with the -MM switch. So in a make file we normally 
have the following rule to generate dependency files and later include them:

-------------------------------------------------------------------------------------
%.d: %.c
            @set -e; rm -f $@; \
             $(CC) -M $(CPPFLAGS) $< > address@hidden; \
             sed 's,\($*\)\.o[ :]*,\1.o $@ : ,g' < address@hidden > $@; \
             rm -f address@hidden

    sources = foo.c bar.c

    include $(sources:.c=.d)
-------------------------------------------------------------------------------------

When using the above facility how can use the "Target specific variable 
values" facility?
For example, I would want the CPP flag -DLINUX to be defined for foo.c only.

Regards,
mwnn