anchor.diff:      darwinConfig=$(NIX_PATH=${concatStringsSep ":" config.nix.nixPath} nix-instantiate --eval -E '<darwin-config>') || true
       if ! test -e "$darwinConfig"; then
           echo "[1;31merror: Changed <darwin-config> but target does not exist, aborting activation[0m" >&2
  -        echo "Move you configuration.nix or set NIX_PATH:" >&2
  +        echo "Move you configuration.nix or set nix.nixPath:" >&2
           echo >&2
           echo "    nix.nixPath = [ \"darwin-config=$(nix-instantiate --eval -E '<darwin-config>')\" ];" >&2
           echo >&2
  
positive.code:     nixpkgsPath=$(NIX_PATH=${concatStringsSep ":" config.nix.nixPath} nix-instantiate --eval -E '<nixpkgs>') || true
      if ! test -e "$nixpkgsPath"; then
          echo "[1;31merror: Changed <nixpkgs> but target does not exist, aborting activation[0m" >&2
          echo "Add a nixpkgs channel or set NIX_PATH:" >&2
          echo "$ sudo nix-channel --add http://nixos.org/channels/nixpkgs-unstable nixpkgs" >&2
          echo "$ sudo nix-channel --update" >&2
          echo >&2
  
negative.code:     darwinPath=$(NIX_PATH=${concatStringsSep ":" config.nix.nixPath} nix-instantiate --eval -E '<darwin>') || true
      if ! test -e "$darwinPath"; then
          echo "[1;31merror: Changed <darwin> but target does not exist, aborting activation[0m" >&2
          echo "Add the darwin repo as a channel or set nix.nixPath:" >&2
          echo "$ sudo nix-channel --add https://github.com/LnL7/nix-darwin/archive/master.tar.gz darwin" >&2
          echo "$ sudo nix-channel --update" >&2
          echo >&2
  