I saw the same problem this morning, determined it was wxallowed
required on /usr. After updating /usr mount with wxallowed
Python build continued.
I decided to search ports mailing list to see if anyone else had the
same issue, stumbled across this thread.
I installed 6.1 from ISO I downloaded right after 6.1 release
announcement. I used installer default partition settings.
I did not create a new partition for ports, so it is a directory
As Adam stated perhaps an update to faq15?