diff --git a/CMakeLists.txt b/CMakeLists.txt
index 405b07bf..51803b05 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -72,7 +72,7 @@ add_subdirectory(xo-randomgen)
 add_subdirectory(xo-ordinaltree)
 add_subdirectory(xo-flatstring)
 add_subdirectory(xo-pyutil)
-#add_subdirectory(xo-reflectutil)
+add_subdirectory(xo-reflectutil)
 #add_subdirectory(xo-reflect)
 #add_subdirectory(xo-pyreflect)
 #add_subdirectory(xo-ratio)
diff --git a/default.nix b/default.nix
index e4f9cd64..031260eb 100644
--- a/default.nix
+++ b/default.nix
@@ -45,7 +45,7 @@ let
           xo-ordinaltree    = self.callPackage pkgs/xo-ordinaltree.nix    {};
           xo-flatstring     = self.callPackage pkgs/xo-flatstring.nix     {};
           xo-pyutil         = self.callPackage pkgs/xo-pyutil.nix         {};
-#          xo-reflectutil    = self.callPackage pkgs/xo-reflectutil.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-ratio          = self.callPackage pkgs/xo-ratio.nix          {};
diff --git a/pkgs/xo-reflectutil.nix b/pkgs/xo-reflectutil.nix
new file mode 100644
index 00000000..7cc8ce5a
--- /dev/null
+++ b/pkgs/xo-reflectutil.nix
@@ -0,0 +1,21 @@
+{
+  # dependencies
+  stdenv, cmake, #catch2,
+
+  xo-cmake, xo-flatstring,
+} :
+
+stdenv.mkDerivation (finalattrs:
+  {
+    name = "xo-reflectutil";
+    version = "1.0";
+
+    src = ../xo-reflectutil;
+
+    cmakeFlags = ["-DCMAKE_MODULE_PATH=${xo-cmake}/share/cmake"];
+    doCheck = true;
+    nativeBuildInputs = [ cmake #catch2
+                          xo-cmake
+                          xo-flatstring
+                        ];
+  })
diff --git a/pkgs/xo-userenv.nix b/pkgs/xo-userenv.nix
index 5c5a299e..99e8c2ad 100644
--- a/pkgs/xo-userenv.nix
+++ b/pkgs/xo-userenv.nix
@@ -30,7 +30,7 @@
   xo-ordinaltree,
   xo-flatstring,
   xo-pyutil,
-#  xo-reflectutil,
+  xo-reflectutil,
 #  xo-ratio,
 #  xo-unit,
 #  xo-pyunit,
@@ -65,7 +65,7 @@ buildEnv {
             xo-ordinaltree
             xo-flatstring
             xo-pyutil
-#            xo-reflectutil
+            xo-reflectutil
 #            xo-reflect
 #            xo-pyreflect
 #            xo-ratio