hmmm. I think I am, but I'll admit that I'm a pretty big NixOS newbie at this point :)

This is how I'm including it

```
  homeManager = (builtins.fetchTarball {
    url = "https://github.com/rycee/home-manager/archive/cba7b6ee6e056421f862b008b45f1ff9cc2e7252.tar.gz";
    sha256 = "1q7diljdkj0q7d7k79rghx3yp683p6q8dg43h8h1bklzrywxir8a";
  });
```

`cba7b6ee6e056421f862b008b45f1ff9cc2e7252` is the most recent commit on master I believe