I'm going to be playing with it some more, trying to see if I can do an
   UNPRIVED build (which _can't_ overwrite /usr/include) into another
   directory; ISTM that the first error above could be caused by a
   partially-changed /usr/include - indeed, the command that errors out is
   an attempt to compile something, but is run as part of a "make
   includes" and hence presumably before the full include tree has been
   built.


use DESTDIR; don't build to /.  i think UNPRIVED forces that.



.mrg.