anchor.diff:  
         packages = forAllSystems (system: {
           inherit (nixpkgsFor.${system}) nix;
  -      } // nixpkgs.lib.optionalAttrs (builtins.elem system linuxSystems) {
  +      } // nixpkgs.lib.optionalAttrs (builtins.elem system linux64BitSystems) {
           nix-static = let
             nixpkgs = nixpkgsFor.${system}.pkgsStatic;
           in with commonDeps nixpkgs; nixpkgs.stdenv.mkDerivation {
  
positive.code:         # Binary package for various platforms.
          build = nixpkgs.lib.genAttrs systems (system: self.packages.${system}.nix);
  
          buildStatic = nixpkgs.lib.genAttrs linuxSystems (system: self.packages.${system}.nix-static);
  
          # Perl bindings for various platforms.
          perlBindings = nixpkgs.lib.genAttrs systems (system: self.packages.${system}.nix.perl-bindings);
  
negative.code: 
        officialRelease = false;
  
        linux64BitSystems = [ "x86_64-linux" "aarch64-linux" ];
        linuxSystems = linux64BitSystems ++ [ "i686-linux" ];
        systems = linuxSystems ++ [ "x86_64-darwin" ];
  
        forAllSystems = f: nixpkgs.lib.genAttrs systems (system: f system);
  