This worked. I followed your advice back from
and ran make and make install for libcxxrt and libc++. Then ran the install steps again with targets in the basejail.
After a few more ports installs, the objc2, gnustep-make and gnustep-base all built and installed.
This is great. Thanks for all the help.
I also ran the 'make check' for -base and only 5 tests failed. Four from NSCalendarDate and one from NSTimeZone. 7903 tests passed.
So to recap the answer for the first question on this thread. Yes, the libcxxrt library is needed in a clean FreeBSD 9.1. libcxxrt and libc++ can be built following David's instructions in the above link.