There are three non non-official packages for git-annex in the Archlinux User Repository. Any of these may be installed manually per AUR guidelines or using a wrapper such as yaourt shown below.

  1. The simplest method is to use the git-annex-bin package based on the prebuilt Linux tarballs. 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.

    $ yaourt -Sy git-annex-bin

  2. A more traditional source package is available at git-annex. This depends on a large number of Haskell packages available from a third party repository or through Cabal. This has been historically a bit problematic and the package frequently sits flagged out of date. The state of dependencies also varies, so some intervention may be required to get this option to work.

    $ yaourt -Sy git-annex

  3. A development package is available at 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.

    $ yaourt -Sy git-annex-git

Finally you may choose to forgo the Archlinux package system and install git-annex directly through cabal.

$ pacman -S git rsync curl wget gnupg openssh cabal-install
$ cabal update
$ cabal install git-annex --bindir=$HOME/bin