diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000..5effec3
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,27 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1769789167,
+        "narHash": "sha256-kKB3bqYJU5nzYeIROI82Ef9VtTbu4uA3YydSk/Bioa8=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "62c8382960464ceb98ea593cb8321a2cf8f9e3e5",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
index c7a9a1c..8d8db49 100644
--- a/flake.nix
+++ b/flake.nix
@@ -1,15 +1,20 @@
 {
-  description = "A very basic flake";
+  description = "itk-SNAP package";
 
   inputs = {
     nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-unstable";
   };
 
-  outputs = { self, nixpkgs }: {
+  outputs =
+    { self, nixpkgs }:
+    let
+      pkgs = import nixpkgs {config = {}; overlays = []; system = "x86_64-linux";};
+    in
+    {
 
-    packages.x86_64-linux.hello = nixpkgs.legacyPackages.x86_64-linux.hello;
+      packages.x86_64-linux.itk-snap = pkgs.callPackage ./itk-snap.nix {};
 
-    packages.x86_64-linux.default = self.packages.x86_64-linux.hello;
+      packages.x86_64-linux.default = self.packages.x86_64-linux.itk-snap;
 
-  };
+    };
 }
diff --git a/itk-snap.nix b/itk-snap.nix
new file mode 100644
index 0000000..50d848f
--- /dev/null
+++ b/itk-snap.nix
@@ -0,0 +1,30 @@
+{
+  stdenv,
+  fetchFromGitHub,
+  cmake,
+  itk,
+  vtk,
+  qt6,
+}:
+
+stdenv.mkDerivation {
+  pname = "itk-snap";
+  version = "v4.2.2";
+
+  src = fetchFromGitHub {
+    owner = "pyushkevich";
+    repo = "itksnap";
+    rev = "v4.2.2";
+    sha256 = "sha256-9aH6BVu7osDbXdUhgiMXOTQnvq96F5+f6gTCU975ZNw=";
+  };
+
+  nativeBuildInputs = [
+    cmake
+    qt6.wrapQtAppsHook
+  ];
+  buildInputs = [
+    itk
+    vtk
+    qt6.qtbase
+  ];
+}