Getting it up and running requires a quick dip (like a toe) into the source and a little excursion into /dev. Here's how:
- Pair your phone with your Mac using the built-in software.
- Download and unpack the tar ball.
- Go into /dev (cd /dev) and find where OS X has stored the link to your phone. Mine was /dev/tty.Bluetooth-Modem.
- In the unpacked directory, open main.cpp with your favorite text editor. Search for #define BTDEV "/dev/tty.rfcomm0" and replace it with #define BTDEV "/dev/tty.step_3_answer". In my case, that would look like #define BTDEV "/dev/tty.Bluetooth-Modem.
- Copy btcontroldrc to ~/.btcontroldrc
- Edit ~/.btcontroldrc to your liking.
- Type make and pray for the best ... did I mention you need the Developer Tools?
- Now just run the new executable.
[robg adds: I haven't tested this one...]

