Update flake.nix

flake.nix

@@ -28,24 +28,21 @@
         {
           default =
             pkgs.mkShell.override
-          
               {
-                packages = with pkgs; [
-
-                  clang-tools
-                  gcc
-                  gcc-arm-embedded
-                  ninja
-                  meson
-                  pkg-config
-                  libcxx
-                ];
-                shellHook = ''
-                  		                echo "welcome to c++ devshell nyaaa :3"
-                '';
-                NIX_BUILD_SHELL = "zsh";
+                # Override stdenv in order to change compiler:
+                # stdenv = pkgs.clangStdenv;
+              }
+              {
+                packages =
+                  with pkgs;
+                  [
+                    clang-tools
+                    cmake
+		    just
+                  ]
+                  ++ (if stdenv.hostPlatform.system == "aarch64-darwin" then [ ] else [ gdb ]);
               };
         }
       );
     };
-}
+}