Installing RAD Arduino Ruby Framework on Mac OS X 10.5

# This assumes you have already have Arduino 12 working properly with your Arduino. ( see http://arduino.cc/en/Main/Software and http://arduino.cc/en/Guide/MacOSX )

cd rad/
rake install_gem
cd ..
rm -r rad/
sudo gem install ParseTree --version=2.2

You should be good to go. Now just create a test app and run an example:

rad this_is_rad
cd this_is_rad
rake make:upload sketch=examples/hello_world