This is the second stable release branch of NixOS. The main enhancements are the following: Installation on UEFI systems is now supported. See for details. NixOS is now based on Glibc 2.19 and GCC 4.8. When upgrading from a previous release, please be aware of the following incompatible changes: Nixpkgs no longer exposes unfree packages by default. If your NixOS configuration requires unfree packages from Nixpkgs, you need to enable support for them explicitly by setting: nixpkgs.config.allowUnfree = true; Otherwise, you get an error message such as: error: package ‘nvidia-x11-331.49-3.12.17’ in ‘…/nvidia-x11/default.nix:56’ has an unfree license, refusing to evaluate The firewall is now enabled by default. If you don’t want this, you need to disable it explicitly: networking.firewall.enable = false; The option boot.loader.grub.memtest86 has been renamed to boot.loader.grub.memtest86.enable. The mysql55 service has been merged into the mysql service, which no longer sets a default for the option services.mysql.package.

This is the first stable release branch of NixOS.