Fix?

modules/linuxcnc.nix

@@ -1,4 +1,4 @@
-{ config, lib, pkgs, ... }:
+{ config, lib, pkgs, python3Full, ... }:
 let
   cfg = config.local.packages.linuxcnc;
   inherit (builtins) filter map pathExists listToAttrs;
@@ -13,9 +13,13 @@ let
     '';
   });
 
+  pythonPkg = (python3Full.withPackages (ps: [
+    ps.pyserial # for camera feedback into linuxcnc
+  ]));
+
   linuxcncEnv = pkgs.buildEnv {
     name = "linuxcnc-env";
-    paths = with pkgs; [ linuxcncWithEC hal-cia402 linuxcnc-ethercat ] ++ linuxcncWithEC.buildInputs;
+    paths = with pkgs; [ linuxcncWithEC hal-cia402 linuxcnc-ethercat pythonPkg ];
   };
 
 in {