diff --git a/CMakeLists.txt b/CMakeLists.txt
index e1cde265..0d68fff3 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -74,7 +74,7 @@ add_subdirectory(xo-flatstring)
 add_subdirectory(xo-pyutil)
 add_subdirectory(xo-reflectutil)
 add_subdirectory(xo-reflect)
-#add_subdirectory(xo-pyreflect)
+add_subdirectory(xo-pyreflect)
 #add_subdirectory(xo-ratio)
 #add_subdirectory(xo-unit)
 #add_subdirectory(xo-pyunit)
diff --git a/default.nix b/default.nix
index 2fcd82b6..18bc79d6 100644
--- a/default.nix
+++ b/default.nix
@@ -47,7 +47,7 @@ let
           xo-pyutil         = self.callPackage pkgs/xo-pyutil.nix         {};
           xo-reflectutil    = self.callPackage pkgs/xo-reflectutil.nix    {};
           xo-reflect        = self.callPackage pkgs/xo-reflect.nix        {};
-#          xo-pyreflect      = self.callPackage pkgs/xo-pyreflect.nix      {};
+          xo-pyreflect      = self.callPackage pkgs/xo-pyreflect.nix      {};
 #          xo-ratio          = self.callPackage pkgs/xo-ratio.nix          {};
 #          xo-unit           = self.callPackage pkgs/xo-unit.nix           {};
 #          xo-pyunit         = self.callPackage pkgs/xo-pyunit.nix         {};
diff --git a/pkgs/xo-pyreflect.nix b/pkgs/xo-pyreflect.nix
new file mode 100644
index 00000000..451d485b
--- /dev/null
+++ b/pkgs/xo-pyreflect.nix
@@ -0,0 +1,51 @@
+{
+  # nixpkgs dependencies
+  stdenv, cmake, catch2, # ... other deps here
+
+  python3Packages,
+
+  # xo dependencies
+  xo-cmake, xo-refcnt, xo-pyutil, xo-reflect,
+
+  # args
+
+  #   attrset for fetching source code.
+  #    { type, owner, repo, ref }
+  #
+  #   e.g. type="github", owner="rconybea", repo="cmake-examples", ref="ex1b"
+  #
+  #   see [[../flake.nix]]
+  #
+  #cmake-examples-ex1-path
+
+  # someconfigurationoption ? false
+} :
+
+stdenv.mkDerivation (finalattrs:
+  {
+    name = "xo-pyreflect";
+    version = "1.0";
+
+    outputs = [
+      "out"
+    ];
+
+    src = ../xo-pyreflect;
+
+    cmakeFlags = ["-DCMAKE_MODULE_PATH=${xo-cmake}/share/cmake"];
+    doCheck = true;
+
+    propagatedBuildInputs = [
+#      xo-refcnt
+      xo-pyutil
+      xo-reflect
+    ];
+
+    nativeBuildInputs = [
+      cmake
+#      catch2
+      xo-cmake
+      python3Packages.pybind11
+    ];
+
+  })
diff --git a/pkgs/xo-userenv.nix b/pkgs/xo-userenv.nix
index f6b1dba8..626a8d4d 100644
--- a/pkgs/xo-userenv.nix
+++ b/pkgs/xo-userenv.nix
@@ -32,10 +32,10 @@
   xo-pyutil,
   xo-reflectutil,
   xo-reflect,
+  xo-pyreflect,
 #  xo-ratio,
 #  xo-unit,
 #  xo-pyunit,
-#  xo-pyreflect,
 #  xo-printjson,
 #  xo-pyprintjson,
 #  xo-callback,
@@ -67,7 +67,7 @@ buildEnv {
             xo-pyutil
             xo-reflectutil
             xo-reflect
-#            xo-pyreflect
+            xo-pyreflect
 #            xo-ratio
 #            xo-unit
 #            xo-pyunit