diff --git a/nixos/common/modules/builder.nix b/nixos/common/modules/builder.nix
new file mode 100644
index 00000000..227851ba
--- /dev/null
+++ b/nixos/common/modules/builder.nix
@@ -0,0 +1,13 @@
+{ pkgs, ... }: {
+  # FoR remote builds
+  # see home-manager: bash.nix:  rebuild-*-remote
+  # users.users.${username}.openssh.authorizedKeys.keyFiles = [ ../../../keys/ssh/builder-keys.txt ];
+
+  # For cross-architecture builds
+  boot.binfmt.emulatedSystems = [ 
+    "aarch64-linux" 
+    "armv7l-linux"
+  ];
+
+  environment.systemPackages = with pkgs; [ qemu_kvm ];
+}