gchristenson: Here is my error for nix, I am on macOS

gistfile1.txt

nathankent@Nathans-MBP ~ % sh <(curl -L https://nixos.org/nix/install) --darwin-use-unencrypted-nix-store-volume
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
100  2699  100  2699    0     0   1495      0  0:00:01  0:00:01 --:--:--  4257
downloading Nix 2.3.10 binary tarball for x86_64-darwin from 'https://releases.nixos.org/nix/nix-2.3.10/nix-2.3.10-x86_64-darwin.tar.xz' to '/var/folders/6l/7gjcs8m10bx3n3tscrqnbg840000gn/T/nix-binary-tarball-unpack.XXXXXXXXXX.NJjOxhoy'...
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 26.6M  100 26.6M    0     0  1421k      0  0:00:19  0:00:19 --:--:-- 2138k
Note: a multi-user installation is possible. See https://nixos.org/nix/manual/#sect-multi-user-installation
Creating volume and mountpoint /nix.

     ------------------------------------------------------------------ 
    | This installer will create a volume for the nix store and        |
    | configure it to mount at /nix.  Follow these steps to uninstall. |
     ------------------------------------------------------------------ 

  1. Remove the entry from fstab using 'sudo vifs'
  2. Destroy the data volume using 'diskutil apfs deleteVolume'
  3. Remove the 'nix' line from /etc/synthetic.conf or the file

Using existing 'Nix Store' volume
performing a single-user installation of Nix...
/var/folders/6l/7gjcs8m10bx3n3tscrqnbg840000gn/T/nix-binary-tarball-unpack.XXXXXXXXXX.NJjOxhoy/unpack/nix-2.3.10-x86_64-darwin/install: directory /nix exists, but is not writable by you. This could indicate that another user has already performed a single-user installation of Nix on this system. If you wish to enable multi-user support see https://nixos.org/nix/manual/#ssec-multi-user. If you wish to continue with a single-user install for nathankent please run 'chown -R nathankent /nix' as root.
nathankent@Nathans-MBP ~ %