Is the altcoin a clone of a coin with a working Gitian setup?
No, it is not. I am attempting to introduce gitian into the coin.
If you have Gitian working on your computer already (e.g. you can build Bitcoin with it) you could try copying the files under Bitcoin's contrib/gitian-descriptors and modifying the repository URL and any necessary dependencies in them. There isn't anything Gitian-specific in Bitcoin's source, so the correct descriptors should be all you need to get it to work.