Users of the [Nix package manager](http://nixos.org/) can install it by running:

    nix-env -i git-annex

When including it in a NixOS configuration.nix file, the name of the reference to the package is

    haskellPackages.git-annex

The build status of the package within Nix can be seen on the [Hydra Build
Farm](http://hydra.nixos.org/job/nixpkgs/trunk/gitAndTools.gitAnnex).