To run the OS X Native front-end as a double-clickable .app: 1) Download and install the Python-Objective C bridge. http://pyobjc.sf.net/ 2) Open a terminal window (in Applications->Utilities->Terminal) 3) Change to the directory where this readme file is located (ie, if it's on your desktop in a "PythonCad" folder, type 'cd ~/Desktop/PythonCad' in the Terminal. 4) Type "python buildapp.py --semi-standalone build" in the terminal window. 5) The PythonCad.app will be located in the newly created "build" directory. Drag it to wherever you usually keep your applications. I make no guarantee this will work on OS X 10.2. It might, it might not. If you can't get it to work, send an e-mail. If it doesn't work but you figure out how to fix it, send an-email. Enjoy.