anchor.diff:      {
         overlay = final: prev:
           let
  -          overrides = final.callPackage ./overrides.nix { };
  +          overrides = prev.callPackage ./overrides.nix { };
             extraPackages = import ./packages.nix;
           in (emacs-overlay.overlay final prev) // rec {
             emacsPackages =
  
positive.code: 
            emacsEnv = emacsPackages.emacsWithPackages extraPackages;
  
            emacsConfig = final.callPackage ./. {
              # Ensure build includes packages.
              trivialBuild =
                emacsPackages.trivialBuild.override { emacs = emacsEnv; };
  
negative.code:             version = lib.substring 0 8 self.lastModifiedDate;
            };
  
            emacsUtils = prev.callPackage ./utils.nix { };
          };
  
        homeManagerModules = { emacsConfig = import ./home-manager.nix; };
  