NixOS/nixpkgs — pull request #1101 by wkennington (2013-10-20 23:04:53+00:00)
Title: Add Grub Development Version

The current version of grub2 is out of date and doesn't have the same level of boot support for btrfs / zfs that the bazaar version does. This patch adds the option to use a development version of grub which tracks a similar version to that of archlinux / gentoo.