nativeBuildInputs = [ pkgs.clang ];

                      nativeBuildInputs = [ pkgs.clang ]
                        ++ pkgs.lib.optionals pkgs.stdenv.isDarwin [ pkgs.xcbuild ];

                    };
                    blake3 = attr: {
                      nativeBuildInputs = pkgs.lib.optionals pkgs.stdenv.isDarwin [ pkgs.xcbuild ];

                      ] ++ lib.optionals stdenv.isDarwin [
                        CoreServices
                        Security
                        SystemConfiguration
                      ];

                      ] ++ lib.optionals stdenv.isDarwin (
                        [ openssl ]
                        ++ with darwin.apple_sdk.frameworks; [
                          CoreServices
                          Security
                          SystemConfiguration
                      ]);