diff --git a/default.nix b/default.nix
index c0c71edf..f8e6bfd3 100644
--- a/default.nix
+++ b/default.nix
@@ -165,6 +165,8 @@ let
             xo-object2        = self.callPackage pkgs/xo-object2.nix        { stdenv = jitStdenv; };
 
             xo-procedure2     = self.callPackage pkgs/xo-procedure2.nix     { stdenv = jitStdenv; };
+            xo-numeric        = self.callPackage pkgs/xo-numeric.nix        { stdenv = jitStdenv; };
+
             xo-ordinaltree    = self.callPackage pkgs/xo-ordinaltree.nix    { stdenv = jitStdenv; };
             #
             xo-webutil        = self.callPackage pkgs/xo-webutil.nix        { stdenv = jitStdenv; };
@@ -517,8 +519,9 @@ in
     gc             = pkgs.xo-gc;
     object         = pkgs.xo-object;
     object2        = pkgs.xo-object2;
-
     procedure2     = pkgs.xo-procedure2;
+    numeric        = pkgs.xo-numeric;
+
     ordinaltree    = pkgs.xo-ordinaltree;
     webutil        = pkgs.xo-webutil;
     pywebutil      = pkgs.xo-pywebutil;
diff --git a/pkgs/xo-numeric.nix b/pkgs/xo-numeric.nix
new file mode 100644
index 00000000..20c80167
--- /dev/null
+++ b/pkgs/xo-numeric.nix
@@ -0,0 +1,31 @@
+{
+  # nixpkgs dependencies
+  lib, stdenv, cmake, catch2,
+
+  xo-procedure2,
+  xo-subsys,
+  xo-cmake,
+
+  doCheck ? true,
+} :
+
+stdenv.mkDerivation (finalattrs:
+  {
+    name = "xo-numeric";
+
+    src = ../xo-numeric;
+
+    cmakeFlags = ["-DCMAKE_MODULE_PATH=${xo-cmake}/share/cmake"]
+                 ++ lib.optionals doCheck ["-DENABLE_TESTING=1"];
+
+    inherit doCheck;
+
+    nativeBuildInputs = [
+      cmake catch2
+      xo-cmake
+    ];
+    propagatedBuildInputs = [
+      xo-procedure2
+      xo-subsys
+    ];
+  })
diff --git a/pkgs/xo-procedure2.nix b/pkgs/xo-procedure2.nix
new file mode 100644
index 00000000..53dc8155
--- /dev/null
+++ b/pkgs/xo-procedure2.nix
@@ -0,0 +1,31 @@
+{
+  # nixpkgs dependencies
+  lib, stdenv, cmake, catch2,
+
+  xo-object2,
+  xo-subsys,
+  xo-cmake,
+
+  doCheck ? true,
+} :
+
+stdenv.mkDerivation (finalattrs:
+  {
+    name = "xo-procedure2";
+
+    src = ../xo-procedure2;
+
+    cmakeFlags = ["-DCMAKE_MODULE_PATH=${xo-cmake}/share/cmake"]
+                 ++ lib.optionals doCheck ["-DENABLE_TESTING=1"];
+
+    inherit doCheck;
+
+    nativeBuildInputs = [
+      cmake catch2
+      xo-cmake
+    ];
+    propagatedBuildInputs = [
+      xo-object2
+      xo-subsys
+    ];
+  })