There are four non non-official packages for git-annex in the Arch Linux User Repository. Any of these may be installed manually per [AUR guidelines](https://wiki.archlinux.org/index.php/AUR_User_Guidelines#Installing_packages) or using a wrapper such as [`yaourt`](https://wiki.archlinux.org/index.php/yaourt) shown below.
1. The simplest method is to use the [git-annex-bin](https://aur.archlinux.org/packages/git-annex-bin/) package based on the [prebuilt Linux tarballs](http://downloads.kitenet.net/git-annex/linux/current/). This package includes many of the binary shims from the pre-built package. Although common Linux system utilities have been stripped in favor of normal dependencies, the pre-configured Haskell libraries included out of the box make this an easy install. The disadvantage is the resulting installation is a bit on the heavy side at nearly 100M.
2. A more traditional source package is available at [git-annex](https://aur.archlinux.org/packages/git-annex/). This depends on a large number of Haskell packages available from a third party repository or through Cabal. You must either enable a 3rd party repo that has the dependencies or have a working Cabal installation. Unless you know what you are doing this is a bit problematic and some intervention may be required to get this option to work. The state of available dependency versions also varies so this may not work at all times.
3. A development package is available at [git-annex-git](https://aur.archlinux.org/packages/git-annex-git/) that functions similarly to the source package but builds directly from the HEAD of the git repository rather that the last official release.
