I got lost in your perl script, so may have missed something; but it
*looks* as if what's happening is that your .d.cmd file records the
prior path of what was $< on your previous run; so the .o file depends
on that (as well as the newly renamed file that's $<) and this is the
problem, not the fact that $< is missing.
I suspect (although I'm no expert on VPATH) that the fix for this is
for your perl script to strip, from each prerequisite listed in the
*.d file, any prefix that's present in VPATH. Then the .d.cmd file
will list paths relative to VPATH and the VPATH machinery shall take
care of things moving among its directories.
Eddy.
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