diff --git a/devices/macbook/configuration.nix b/devices/macbook/configuration.nix
index 8a21193..147421d 100644
--- a/devices/macbook/configuration.nix
+++ b/devices/macbook/configuration.nix
@@ -50,23 +50,28 @@ in {
       "brave-browser"
       "qutebrowser"
       "stremio"
+      "firefox"
 
       # work
       "slack"
       "tunnelblick"
       "dbeaver-community"
       "claude"
+      "adobe-acrobat-reader"
 
       # doom emacs
       "font-symbols-only-nerd-font"
+
+      # media
+      "inkscape"
+      "obs"
     ];
   };
-
   nix = {
     # Necessary for using flakes on this system.
     settings.experimental-features = "nix-command flakes";
     extraOptions = ''
-      extra-platforms = x86_64-darwin aarm64-darwin
+      extra-platforms = x86_64-darwin aarch64-darwin aarch64-linux
     '';
     gc = {
       automatic = true;
@@ -77,6 +82,31 @@ in {
       };
       options = "--delete-older-than 15d";
     };
+
+    linux-builder = {
+      enable = true;
+    };
+
+    distributedBuilds = true;
+    buildMachines = [
+      {
+        hostName = "server.local";
+        sshUser = "polen";
+        sshKey = "/Users/charles/.ssh/id_ed25519";
+        systems = [ "x86_64-linux" "aarch64-linux" ];
+        # optional but recommended:
+        maxJobs = 4;              # how many concurrent builds to send
+        speedFactor = 1;          # relative priority vs other builders
+        supportedFeatures = [ "nixos-test" "big-parallel" "kvm" ];
+      }
+    ];
+    settings.builders-use-substitutes = true;
+
+    settings = {
+      extra-substituters = [ "s3://rc-nix-binary-cache?region=ca-central-1" ];
+      extra-trusted-public-keys = [ "rc-nix-cache:3nJzc2e0wK0zpTmiphHLYJWOMuKJ0Fj/TOF5ulUxr/Q=" ];
+      secret-key-files = [ "/Users/charles/.config/nix/rc-nix-cache-priv-key.pem" ];
+    };
   };
 
   # Create /etc/zshrc that loads the nix-darwin environment.