Don't install alacritty on neelix or non-graphical installs.

nix/configuration/roles/alacritty/default.nix

@@ -7,18 +7,32 @@
 
 {
   imports = [ ];
-
-  environment.systemPackages = with pkgs; [
-    alacritty
-    xdg-utils # for xdg-open
-  ];
-
-  home-manager.users.talexander =
-    { pkgs, ... }:
-    {
-      home.file.".config/alacritty/alacritty.toml" = {
-        source = ./files/alacritty.toml;
-      };
+  options.me = {
+    alacritty.enable = lib.mkOption {
+      type = lib.types.bool;
+      default = false;
+      example = true;
+      description = "Whether we want to install alacritty.";
     };
+  };
+
+  config = lib.mkIf config.me.alacritty.enable (
+    lib.mkMerge [
+      (lib.mkIf config.me.graphical {
+        environment.systemPackages = with pkgs; [
+          alacritty
+          xdg-utils # for xdg-open
+        ];
+
+        home-manager.users.talexander =
+          { pkgs, ... }:
+          {
+            home.file.".config/alacritty/alacritty.toml" = {
+              source = ./files/alacritty.toml;
+            };
+          };
+      })
+    ]
+  );
 
 }