I've been outed on Twitter:
I've been working on this pull request for the past couple of weeks as I've been exploring the possibility of using NixOS as a new substrate for building Cerana. If those experiments pan out we'll be switching over from our old build system to a new one based around using Nix/NixOS.
If you haven't heard of Nix or NixOS, I highly recommend taking a look at it (I recommend at least glancing at the introduction to Nix from the Nix manual.)
For the SmartOS fans among my readers, there are a couple of Nix related images available from datasets.at (click here and type in "nixos" to find them.)
And for the Docker fans, I found this article about Cheap Docker Images with Nix interesting as well.