diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000..8f95add
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,222 @@
+{
+  "nodes": {
+    "flake-compat": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1761588595,
+        "narHash": "sha256-XKUZz9zewJNUj46b4AJdiRZJAvSZ0Dqj2BNfXvFlJC4=",
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "rev": "f387cd2afec9419c8ee37694406ca490c3f34ee5",
+        "type": "github"
+      },
+      "original": {
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "type": "github"
+      }
+    },
+    "ghostty": {
+      "inputs": {
+        "flake-compat": "flake-compat",
+        "home-manager": "home-manager",
+        "nixpkgs": [
+          "jlibghostty",
+          "nixpkgs"
+        ],
+        "systems": "systems",
+        "zig": "zig",
+        "zon2nix": "zon2nix"
+      },
+      "locked": {
+        "lastModified": 1779812402,
+        "narHash": "sha256-gozJEyJHbaAyrbzODKeWJhxpUrGK6m4DIPDogfjz2BU=",
+        "owner": "ghostty-org",
+        "repo": "ghostty",
+        "rev": "2e5ad917eb4e325a3dbb161c3f41208a8cd35e44",
+        "type": "github"
+      },
+      "original": {
+        "owner": "ghostty-org",
+        "repo": "ghostty",
+        "type": "github"
+      }
+    },
+    "home-manager": {
+      "inputs": {
+        "nixpkgs": [
+          "jlibghostty",
+          "ghostty",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1770586272,
+        "narHash": "sha256-Ucci8mu8QfxwzyfER2DQDbvW9t1BnTUJhBmY7ybralo=",
+        "owner": "nix-community",
+        "repo": "home-manager",
+        "rev": "b1f916ba052341edc1f80d4b2399f1092a4873ca",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "home-manager",
+        "type": "github"
+      }
+    },
+    "jlibghostty": {
+      "inputs": {
+        "ghostty": "ghostty",
+        "nixpkgs": "nixpkgs"
+      },
+      "locked": {
+        "lastModified": 1779889299,
+        "narHash": "sha256-B82MyhTvlfeszdcuM3F8YDSZYaxUom+m59oQKSoWjmQ=",
+        "ref": "refs/heads/main",
+        "rev": "eea43843002f8fae4fa4cb1c46b64339124bf6b2",
+        "revCount": 6,
+        "type": "git",
+        "url": "https://gitea.gregorlohaus.com/gregor/jlibghostty.git"
+      },
+      "original": {
+        "type": "git",
+        "url": "https://gitea.gregorlohaus.com/gregor/jlibghostty.git"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1779560665,
+        "narHash": "sha256-tpyBcxPpcQb8ukyNF7DoCwfSY3VPsxHoYwj00Cayv5o=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "64c08a7ca051951c8eae34e3e3cb1e202fe36786",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs_2": {
+      "locked": {
+        "lastModified": 1779560665,
+        "narHash": "sha256-tpyBcxPpcQb8ukyNF7DoCwfSY3VPsxHoYwj00Cayv5o=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "64c08a7ca051951c8eae34e3e3cb1e202fe36786",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "jlibghostty": "jlibghostty",
+        "nixpkgs": "nixpkgs_2"
+      }
+    },
+    "systems": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    },
+    "zig": {
+      "inputs": {
+        "flake-compat": [
+          "jlibghostty",
+          "ghostty",
+          "flake-compat"
+        ],
+        "nixpkgs": [
+          "jlibghostty",
+          "ghostty",
+          "nixpkgs"
+        ],
+        "systems": [
+          "jlibghostty",
+          "ghostty",
+          "systems"
+        ]
+      },
+      "locked": {
+        "lastModified": 1776789209,
+        "narHash": "sha256-G6B7Q4TXn7MZ1mB+f9rymjsYF5PLWoSvmbxijb/99bw=",
+        "owner": "mitchellh",
+        "repo": "zig-overlay",
+        "rev": "14fe971844e841297ddd2ce9783d6892b467af39",
+        "type": "github"
+      },
+      "original": {
+        "owner": "mitchellh",
+        "repo": "zig-overlay",
+        "type": "github"
+      }
+    },
+    "zig_2": {
+      "inputs": {
+        "nixpkgs": [
+          "jlibghostty",
+          "ghostty",
+          "zon2nix",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1777234348,
+        "narHash": "sha256-fKw44a4qbUuI5eTG8k0gPbqMV5TOrjYF35PBzsYgd2U=",
+        "ref": "refs/heads/main",
+        "rev": "2c781c0609ecda600ab98f98cca417bbd981bd53",
+        "revCount": 1677,
+        "type": "git",
+        "url": "https://codeberg.org/jcollie/zig-overlay.git"
+      },
+      "original": {
+        "type": "git",
+        "url": "https://codeberg.org/jcollie/zig-overlay.git"
+      }
+    },
+    "zon2nix": {
+      "inputs": {
+        "nixpkgs": [
+          "jlibghostty",
+          "ghostty",
+          "nixpkgs"
+        ],
+        "zig": "zig_2"
+      },
+      "locked": {
+        "lastModified": 1777314365,
+        "narHash": "sha256-eLxQaD0wc96Neqkln8wHS0rNq/chPODifFkhwrwilEU=",
+        "owner": "jcollie",
+        "repo": "zon2nix",
+        "rev": "a5a1d412ad1ab6305511997bbc92b3a9dd6cb784",
+        "type": "github"
+      },
+      "original": {
+        "owner": "jcollie",
+        "ref": "main",
+        "repo": "zon2nix",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
index a0b5626..118355d 100644
--- a/flake.nix
+++ b/flake.nix
@@ -13,6 +13,7 @@
 
       jlib = jlibghostty.packages.${system}.jlibghostty;
       graalvm = pkgs.graalvmPackages.graalvm-ce;
+      gradle = if pkgs ? gradle_9 then pkgs.gradle_9 else pkgs.gradle;
     in {
       packages.${system}.default = pkgs.stdenvNoCC.mkDerivation {
         pname = "jprototerm";
@@ -21,7 +22,7 @@
 
         nativeBuildInputs = [
           graalvm
-          pkgs.gradle
+          gradle
           pkgs.makeWrapper
         ];
 
@@ -34,6 +35,7 @@
 
           gradle \
             --no-daemon \
+            --stacktrace \
             -PjlibghosttyMavenRepo=${jlib}/maven \
             nativeCompile
 
@@ -57,7 +59,7 @@
       devShells.${system}.default = pkgs.mkShell {
         packages = [
           graalvm
-          pkgs.gradle
+          gradle
           pkgs.util-linux
         ];