Thanks to Christoph Murauer for an excellent guide to installing Snort 2.9.1.2 on Mac OS X!
Check out Christoph's Snort 2.9.1.2 install guide here.
Thanks to all of our Snort community contributors on their documentation, if you'd like to contribute some documentation and have it hosted on http://snort.org/docs, please feel free to contact me at joel@snort.org, and if we put your guides/whitepapers up on the site, we'll send you some Snort swag!
As always Snort.org makes no warranty or edits to submitted documentation, and we'd like to thank the contributors of the documentation for their time.