Mac OSX build fails with "no such file to load -- spec/rake/spectask"

Running "make" successfully builds the compiler and most of the libs but fails out on the ruby lib with the message:

Making all in rb
/usr/bin/rake
(in ... thrift/lib/rb)
rake aborted!
no such file to load – spec/rake/spectask
... thrift/lib/rb/Rakefile:23

The one hit I found online that might be related:
https://github.com/cgs/evernote/pull/5
"The "no such file to load – spec/rake/spectask" error is because this gem's specs use rspec1.
I just submitted a pull request to update to rspec2."

I'm running with pkgconfig from MacPorts and starting the build from scratch (bootstrap.sh & onwards).