diff --git a/pkgs/xo-ordinaltree.nix b/pkgs/xo-ordinaltree.nix
new file mode 100644
index 00000000..769b8806
--- /dev/null
+++ b/pkgs/xo-ordinaltree.nix
@@ -0,0 +1,28 @@
+{
+  # nixpkgs dependencies
+  stdenv, cmake, catch2,
+
+  # xo dependencies
+  xo-cmake,
+  xo-refcnt,
+  xo-randomgen,
+#  xo-reflect,
+    #, xo-indentlog,
+} :
+
+stdenv.mkDerivation (finalattrs:
+  {
+    name = "xo-ordinaltree";
+
+    src = ../xo-ordinaltree;
+
+    cmakeFlags = ["-DCMAKE_MODULE_PATH=${xo-cmake}/share/cmake"];
+    doCheck = true;
+    nativeBuildInputs = [
+      cmake catch2 xo-cmake
+    ];
+    propagatedBuildInputs = [
+      xo-refcnt
+      xo-randomgen
+    ];
+  })