<isd>
garrison: yeah, it doesn't need to include the capnp binaries. We also don't need to copy ekam-bootstrap. I mostly hadn't gotten that far, since I was focusing on the fact that it doesn't build.
<isd>
There's another design question re: what to do when we compose this with larger packages; ekam wants to build everything in-tree, which sadly means we'd be building capnproto twice if we just have a sandstorm-nix depend on this.
<isd>
I'm about to go out for a run though. Later.
<isd>
(Also, to everyone else: ekam now builds with nix)