bba5b1c434
enable = false; didn't help, but downgrading did. It's a mystery to me. Discussion: https://github.com/NixOS/nixpkgs/commit/c9f8fb4d127a
*** NixOS *** NixOS is a Linux distribution based on the purely functional package management system Nix. More information can be found at http://nixos.org/nixos and in the manual in doc/manual.