[aur-general] How would I implement this?

Hi, I've wrote a couple of basic PKGBUILD files which simply pull from github and compile but this time I need something a bit more. Basically I need to pull in some dependencies from other repositories (easy) and then invoke a command via one of the Common Lisp implementations which may be available on the system. I'm not sure how to set up the dependencies for that. Any ideas? Aaron