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

nix/configuration/hosts/neelix/default.nix

@@ -23,10 +23,9 @@
   # Mount tmpfs at /tmp
   boot.tmp.useTmpfs = true;
 
-  me.graphical = true;
-  me.graphicsCardType = "intel";
-
-  me.kodi.enable = true;
   me.bluetooth.enable = true;
   me.emacs_flavor = "plainmacs";
+  me.graphical = true;
+  me.graphicsCardType = "intel";
+  me.kodi.enable = true;
 }

nix/configuration/hosts/odo/default.nix

@@ -29,10 +29,10 @@
     fw-ectool
   ];
 
-  me.graphical = true;
+  me.alacritty.enable = true;
-  me.graphicsCardType = "amd";
-
-  me.sway.enable = true;
   me.ansible.enable = true;
   me.emacs_flavor = "full";
+  me.graphical = true;
+  me.graphicsCardType = "amd";
+  me.sway.enable = true;
 }

nix/configuration/roles/alacritty/default.nix

@@ -7,7 +7,18 @@
 
 {
   imports = [ ];
+  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
@@ -20,5 +31,8 @@
               source = ./files/alacritty.toml;
             };
           };
+      })
+    ]
+  );
 
 }