diff --git a/CMakeLists.txt b/CMakeLists.txt
index 59dd882b..303dbff8 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -81,6 +81,7 @@ add_subdirectory(xo-pyunit)
 #
 add_subdirectory(xo-callback)
 add_subdirectory(xo-webutil)
+add_subdirectory(xo-pywebutil)
 #
 add_subdirectory(xo-expression)
 add_subdirectory(xo-pyexpression)
@@ -89,7 +90,6 @@ add_subdirectory(xo-reader)
 add_subdirectory(xo-jit)
 add_subdirectory(xo-pyjit)
 #
-#add_subdirectory(xo-pywebutil)
 #add_subdirectory(xo-printjson)
 #add_subdirectory(xo-pyprintjson)
 #add_subdirectory(xo-reactor)
diff --git a/default.nix b/default.nix
index 26083539..c659b221 100644
--- a/default.nix
+++ b/default.nix
@@ -54,6 +54,7 @@ let
 #
           xo-callback       = self.callPackage pkgs/xo-callback.nix       {};
           xo-webutil        = self.callPackage pkgs/xo-webutil.nix        {};
+          xo-pywebutil      = self.callPackage pkgs/xo-pywebutil.nix      {};
 #
           xo-expression     = self.callPackage pkgs/xo-expression.nix     {};
           xo-pyexpression   = self.callPackage pkgs/xo-pyexpression.nix   {};
@@ -64,7 +65,6 @@ let
                                                                             clang = llvmPackages.clang;
                                                                             llvm = llvmPackages.llvm; };
           xo-pyjit          = self.callPackage pkgs/xo-pyjit.nix          {};
-#          xo-pywebutil      = self.callPackage pkgs/xo-pywebutil.nix      {};
 #          xo-printjson      = self.callPackage pkgs/xo-printjson.nix      {};
 #          xo-pyprintjson    = self.callPackage pkgs/xo-pyprintjson.nix    {};
 #          xo-reactor        = self.callPackage pkgs/xo-reactor.nix        {};
diff --git a/pkgs/xo-pywebutil.nix b/pkgs/xo-pywebutil.nix
new file mode 100644
index 00000000..cd078c10
--- /dev/null
+++ b/pkgs/xo-pywebutil.nix
@@ -0,0 +1,59 @@
+{
+  # nixpkgs dependencies
+  stdenv, cmake, catch2, # ... other deps here
+
+  python3Packages,
+
+  # xo dependencies
+  xo-cmake,
+
+  xo-webutil,
+  #xo-refcnt,
+  #xo-pyutil,
+  #xo-reflect,
+
+  xo-pyutil,
+
+  # 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-pywebutil";
+    version = "1.0";
+
+    outputs = [
+      "out"
+    ];
+
+    src = ../xo-pywebutil;
+
+    cmakeFlags = ["-DCMAKE_MODULE_PATH=${xo-cmake}/share/cmake"];
+    doCheck = true;
+
+    propagatedBuildInputs = [
+#      xo-refcnt
+      xo-pyutil
+      xo-webutil
+#      xo-reflect
+    ];
+
+    nativeBuildInputs = [
+      cmake
+#      catch2
+      xo-cmake
+      python3Packages.pybind11
+    ];
+
+  })
diff --git a/pkgs/xo-userenv.nix b/pkgs/xo-userenv.nix
index dc0b75ef..1dd14d5a 100644
--- a/pkgs/xo-userenv.nix
+++ b/pkgs/xo-userenv.nix
@@ -39,9 +39,9 @@
 #
   xo-callback,
   xo-webutil,
+  xo-pywebutil,
 #  xo-printjson,
 #  xo-pyprintjson,
-#  xo-pywebutil,
 #  xo-reactor,
 #  xo-pyreactor,
 #  xo-simulator,
@@ -79,15 +79,14 @@ buildEnv {
 #
             xo-callback
             xo-webutil
+            xo-pywebutil
 #
             xo-expression
             xo-pyexpression
             xo-tokenizer
             xo-reader
             xo-jit
-
 #            xo-pyjit
-#            xo-pywebutil
 #            xo-printjson
 #            xo-pyprintjson
 #            xo-reactor