I suggest that you start with a clean tree and change nothing except the "duplex =" line, and see what happens. Also, remember that any time you have to do a new "make" with a source tree you've already used, you have to run "make clean" first. In this case, though, I think you might just want to start fresh, chanbge just the one line by uncommenting it, and then see whether or not anything else really needs editing.
