Actually, I'm on to something. It DOES generate the headers, but it puts 
them somewhere that -I doesn't reach... silly. But if I copy the new 
header after every failure to a place that is covered by -I, it passes 
that place... I figure if I keep doing this it will eventually break 
through.

The better solution is to mangle the Makefile so -I points where it 
should. No idea why this is broken on my system and nobody else's.

Will report once done.