add some stuff

overlays.nix

@@ -1,5 +1,10 @@
 # This file defines overlays
-{ inputs, ... }: {
+{ inputs, ... }: 
+let
+  addPatches = pkg: patches:
+    pkg.overrideAttrs
+    (oldAttrs: { patches = (oldAttrs.patches or [ ]) ++ patches; });
+in {
   # This one brings our custom packages from the 'pkgs' directory
   additions = final: _prev: import ./pkgs { pkgs = final; };
 
@@ -39,6 +44,7 @@
     # example = prev.example.overrideAttrs (oldAttrs: rec {
     # ...
     # });
+    mangal = addPatches prev.mangal [ ./pkgs/patches/mangal.diff ];
   };
 
   # When applied, the unstable nixpkgs set (declared in the flake inputs) will