first attempt at a derivation

flake.nix

@@ -32,6 +32,8 @@
       let pkgs = import nixpkgs { inherit overlays system; };
       in rec {
         devShell = pkgs.devShell;
+        packages.ghostty = pkgs.ghostty;
+        defaultPackage = packages.ghostty;
       }
     );
 }

nix/overlay.nix

@@ -8,6 +8,7 @@ final: prev: rec {
   #
 
   devShell = prev.callPackage ./devshell.nix { };
+  ghostty = prev.callPackage ./package.nix { };
 
   wraptest = prev.callPackage ./wraptest.nix { };
 

nix/package.nix

@@ -0,0 +1,35 @@
+{ stdenv
+, lib
+, zig
+}:
+
+stdenv.mkDerivation rec {
+  pname = "ghostty";
+  version = "0.1.0";
+
+  src = ./..;
+
+  nativeBuildInputs = [ zig ];
+
+  buildInputs = [];
+
+  dontConfigure = true;
+
+  # preBuild = ''
+  #   export HOME=$TMPDIR
+  # '';
+
+  installPhase = ''
+    runHook preInstall
+    zig build -Drelease-safe --prefix $out install
+    runHook postInstall
+  '';
+
+  outputs = [ "out" ];
+
+  meta = with lib; {
+    homepage = "https://github.com/mitchellh/ghostty";
+    license = licenses.mit;
+    platforms = [ "x86_64-linux" "aarch64-linux" "aarch64-darwin" ];
+  };
+}