diff --git a/nixos/nixified.ai.nix b/nixos/nixified.ai.nix
index 85aa1923..079ee22d 100644
--- a/nixos/nixified.ai.nix
+++ b/nixos/nixified.ai.nix
@@ -30,8 +30,22 @@
           };
           packagesAlreadyInPrev =
             builtins.filter (name: python-prev ? ${name}) (builtins.attrNames extraPackages);
+          nixifiedExtraPackages = builtins.removeAttrs extraPackages packagesAlreadyInPrev;
         in
-          builtins.removeAttrs extraPackages packagesAlreadyInPrev
+          nixifiedExtraPackages
+          // {
+            tokenizers = python-prev.tokenizers.overrideAttrs (old: {
+              nativeBuildInputs = (old.nativeBuildInputs or []) ++ [final.clang];
+              env =
+                (old.env or {})
+                // {
+                  CC = "${final.clang}/bin/clang";
+                  HOST_CC = "${final.clang}/bin/clang";
+                  CC_x86_64_unknown_linux_gnu = "${final.clang}/bin/clang";
+                  CFLAGS = "-O2";
+                };
+            });
+          }
       );
     };
 
diff --git a/nixos/xmonad.nix b/nixos/xmonad.nix
index 406993d6..c3f9b19b 100644
--- a/nixos/xmonad.nix
+++ b/nixos/xmonad.nix
@@ -14,6 +14,21 @@ in
     nixpkgs.overlays = with inputs; [
       xmonad.overlay
       xmonad-contrib.overlay
+      (final: prev: {
+        haskellPackages = prev.haskellPackages.override (old: {
+          overrides =
+            final.lib.composeExtensions (old.overrides or (_: _: {}))
+            (_hself: hsuper: {
+              ghc-exactprint = final.haskell.lib.disableOptimization hsuper.ghc-exactprint;
+              language-c = final.haskell.lib.disableOptimization hsuper.language-c;
+              optics-core = final.haskell.lib.disableOptimization hsuper.optics-core;
+              X11 = final.haskell.lib.disableOptimization hsuper.X11;
+              X11-xft =
+                final.haskell.lib.dontHaddock
+                (final.haskell.lib.disableOptimization hsuper.X11-xft);
+            });
+        });
+      })
       (import ../dotfiles/config/xmonad/overlay.nix)
     ];