Oh, interesting, I will just do

ifndef foobar.h
foobar.h:;
foobar.h=1
endif

easiest to "emit".  This is obvious in C, but somehow did not internalize in my 
head for make syntax yet, to be obvious here.  
>Rather than emitting simply:

        foobar.h:;

Why not emit something like this:

        ifndef _foobar_rule
        foobar.h:;
        _foobar_rule=1
        endif



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