This will not be a long post, just more information on how to install Doxygen on Max OSX. It has an installer, that includes an executable to run the doxygen with a wizard. However, it is better to install it via command line often times. For my use case I will be using Doxygen along with a post-commit hook in order to automate my documentation.
Once you install Doxygen with the OSX installer, you can then create a symbolic link to /user/local/bin, or another location in your system PATH, like below: