Oh I missed the questions:
I am on an old 12" G4 Powerbook on OS X 10.4.6
I do have the Development tools installed. Because I also want to write code for the board in C, I have build the whole toolchain including the avr-gcc and serialproxy etc.
I used sudo only to install (make install). I also did not change the target so everything got build for /usr/local. I did not have any problems compiling and installing.
-mj