I'm new to Emacs/Aquamacs, and want to use it to program in Prolog. My filename ends with ".pl" and Aquamacs automatically assumes it's a Perl file. How do I change it to use Prolog mode instead? I'd prefer an answer that doesn't assume I know how to get around in Emacs at all.
Under Preferences -> Programming -> Languages. I cannot find Prolog, even though the Aquamacs webpage states it's supposed to support Prolog? Do I need to install some addon?