diff --git a/default.nix b/default.nix
index 93d476dc..bdfe93b1 100644
--- a/default.nix
+++ b/default.nix
@@ -135,11 +135,12 @@ let
         {
             xo-cmake          = self.callPackage pkgs/xo-cmake.nix          {};
             xo-indentlog      = self.callPackage pkgs/xo-indentlog.nix      { buildDocs = true; buildExamples = true; };
-            xo-refcnt         = self.callPackage pkgs/xo-refcnt.nix         {};
             xo-subsys         = self.callPackage pkgs/xo-subsys.nix         {};
             xo-randomgen      = self.callPackage pkgs/xo-randomgen.nix      {                   buildExamples = true; };
             xo-reflectutil    = self.callPackage pkgs/xo-reflectutil.nix    {};
             xo-arena          = self.callPackage pkgs/xo-arena.nix          {};
+            xo-facet          = self.callPackage pkgs/xo-facet.nix          {};
+            xo-refcnt         = self.callPackage pkgs/xo-refcnt.nix         {};
             xo-ordinaltree    = self.callPackage pkgs/xo-ordinaltree.nix    {};
             xo-flatstring     = self.callPackage pkgs/xo-flatstring.nix     { buildDocs = true; buildExamples = true; };
             xo-pyutil         = self.callPackage pkgs/xo-pyutil.nix         {};
@@ -483,6 +484,7 @@ in
     subsys         = pkgs.xo-subsys;
     randomgen      = pkgs.xo-randomgen;
     arena          = pkgs.xo-arena;
+    facet          = pkgs.xo-facet;
     ordinaltree    = pkgs.xo-ordinaltree;
     flatstring     = pkgs.xo-flatstring;
     pyutil         = pkgs.xo-pyutil;
diff --git a/pkgs/xo-facet.nix b/pkgs/xo-facet.nix
new file mode 100644
index 00000000..79fec39c
--- /dev/null
+++ b/pkgs/xo-facet.nix
@@ -0,0 +1,30 @@
+{
+  # nixpkgs dependencies
+  stdenv, cmake, catch2,
+
+  # xo dependencies
+  xo-cmake,
+  xo-arena,
+#  xo-reflectutil,
+#  xo-indentlog,
+} :
+
+stdenv.mkDerivation (finalattrs:
+  {
+    name = "xo-facet";
+
+    src = ../xo-facet;
+
+    cmakeFlags = ["-DCMAKE_MODULE_PATH=${xo-cmake}/share/cmake"
+                  "-DENABLE_TESTING=1"
+                 ];
+    doCheck = true;
+    nativeBuildInputs = [
+      cmake catch2 xo-cmake
+    ];
+    propagatedBuildInputs = [
+      xo-arena
+#      xo-reflectutil
+#      xo-indentlog
+    ];
+  })