### Please describe the problem.
In recent nixpkgs the S3 special remotes have been disabled because some of the dependencies are quite old or unmaintained.
More detail here: <https://github.com/NixOS/nixpkgs/issues/45686>

### What steps will reproduce the problem?
Installing git-annex from the 18.09 nixpkgs release.

> [[done]]; the esqueleto dep was dropped and deps are fairly current now.
> --[[Joey]]
