All in all, it looks like the patch is in good shape. There's another important thing to do, which is to actually document it.
I'd like a patch to bsd.port.mk(5) Also, this part of the FAQ is woefully incomplete. http://www.openbsd.org/faq/ports/specialtopics.html#Autoconf it would be swell if you guys did also add to it, explaining what to watch out for, the vagaries of libtoolize, autogen.sh and whatever. You definitely have more experience than I do in that area.
