Install unprefixed coreutils on Mac for the sake of dired

nix/modules/emacs.nix

@@ -1,16 +1,18 @@
 { config, lib, pkgs, ... }:
 with config.lib.file;
 let dotdir = "${config.home.homeDirectory}/.dotfiles";
+    isOnMac = pkgs.stdenv.hostPlatform.isDarwin;
 in
 {
   programs.emacs.enable = true;
   programs.emacs.package = pkgs.emacs;
   programs.emacs.extraPackages = epkgs: [ epkgs.vterm ];
 
-  home.packages = with pkgs; [
-    # Required by nativeComp but not a dependency for some reason
-    zstd
-  ];
+  home.packages = with pkgs; let
+    basePackages = [ zstd ];
+    macPackages = basePackages ++ [ coreutils ];
+  in
+    if isOnMac then macPackages else basePackages;
 
   xdg.configFile = {
     "emacs".source = mkOutOfStoreSymlink "${dotdir}/thoom-emacs";