let requiredVersion = import ./lib/minver.nix; in

if ! builtins ? nixVersion || builtins.compareVersions requiredVersion builtins.nixVersion == 1 then

  abort ''

    This version of Nixpkgs requires Nix >= ${requiredVersion}, please upgrade:

    - If you are running NixOS, `nixos-rebuild' can be used to upgrade your system.

    - Alternatively, with Nix > 2.0 `nix upgrade-nix' can be used to imperatively
      upgrade Nix. You may use `nix-env --version' to check which version you have.

    - If you installed Nix using the install script (https://nixos.org/nix/install),
      it is safe to upgrade by running it again:

          curl https://nixos.org/nix/install | sh

    For more information, please see the NixOS release notes at
    https://nixos.org/nixos/manual or locally at
    ${toString ./doc/manual/release-notes}.

    If you need further help, see https://nixos.org/nixos/support.html
  ''

else

  import ./pkgs/top-level/impure.nix

let requiredVersion = import ./lib/minver.nix; in

if ! builtins ? nixVersion || builtins.compareVersions requiredVersion builtins.nixVersion == 1 then

  abort ''

    This version of Nixpkgs requires Nix >= ${requiredVersion}, please upgrade:

    - If you are running NixOS, `nixos-rebuild' can be used to upgrade your system.

    - Alternatively, with Nix > 2.0 `nix upgrade-nix' can be used to imperatively
      upgrade Nix. You may use `nix-env --version' to check which version you have.

    - If you installed Nix using the install script (https://nixos.org/nix/install),
      it is safe to upgrade by running it again:

          curl https://nixos.org/nix/install | sh

    For more information, please see the NixOS release notes at
    https://nixos.org/nixos/manual or locally at
    ${toString ./nixos/doc/manual/release-notes}.

    If you need further help, see https://nixos.org/nixos/support.html
  ''

else

  import ./pkgs/top-level/impure.nix

Fix local path to release notes in error message
Fix local path to release notes in error message

The error message when produced when Nix is too old refers the user to a local
copy of the NixOS release notes, but the provided path is incorrect.
