It's been failing since forever.
It requires a writable /nix/store to store the build result. Also, wait until we've reached multi-user.target before doing the build, and do a sync at the end to ensure all data to $out is properly written. http://hydra.nixos.org/build/6496716
Signed-off-by: Shea Levy <shea@shealevy.com>
http://hydra.nixos.org/build/6480163