Unfortunately, everything on my 10.6.8 / libc++ system updated to the current ports tree without any trouble (except OpenBLAS, which is a different issue).
I already had clang-8.0 installed (as I fixed it for 10.6.8 in the first place), and so I didn't have to bootstrap anything. Maybe that is why it all went smoothly for me. As Josh says, if you're stuck, post a ticket and we can work through it with you. Ken
