anchor.diff:      fi
     '';
   
  -  buildUsers = optionalString config.services.nix-daemon.enable ''
  +  buildUsers = ''
       buildUser=$(dscl . -read /Groups/nixbld GroupMembership 2>&1 | awk '/^GroupMembership: / {print $2}') || true
       if [ -z $buildUser ]; then
           echo "[1;31merror: Using the nix-daemon requires build users, aborting activation[0m" >&2
  
positive.code: with lib;
  
  let
    darwinChanges = ''
      darwinChanges=/dev/null
      if test -e /run/current-system/darwin-changes; then
  
negative.code:     fi
    '';
  
    nixGarbageCollector = ''
      if test -O /nix/store; then
          echo "[1;31merror: A single-user install can't run gc as root, aborting activation[0m" >&2
          echo "Configure the garbage collector to run as the current user:" >&2
  