nix: do not add android SDK on aarch64 Darwin

Otherwise it fails with:

error: aarch64-darwin not supported for Android SDK. Use: NIXPKGS_SYSTEM_OVERRIDE=x86_64-darwin

Signed-off-by: Jakub Sokołowski <[email protected]>

Author: jakubgs

nix/default.nix

@@ -88,5 +88,3 @@ in stdenv.mkDerivation rec {
     platforms = ["x86_64-linux" "aarch64-linux" "x86_64-darwin" "aarch64-darwin" "x86_64-windows"];
   };
 }
-
-

nix/shell.nix

@@ -2,21 +2,23 @@
   pkgs ? import <nixpkgs> { },
 }:
 let
-  optionalDarwinDeps = pkgs.lib.optionals pkgs.stdenv.isDarwin [
-    pkgs.libiconv
-    pkgs.darwin.apple_sdk.frameworks.Security
-  ];
-in
-pkgs.mkShell {
-  inputsFrom = [
+  inherit (pkgs) lib stdenv;
+  /* No Android SDK for Darwin aarch64. */
+  isMacM1 = stdenv.isDarwin && stdenv.isAarch64;
+
+in pkgs.mkShell {
+  inputsFrom = lib.optionals isMacM1 [
     pkgs.androidShell
-  ] ++ optionalDarwinDeps;
+  ];
 
   buildInputs = with pkgs; [
     which
     git
     cmake
     nim-unwrapped-2_2
+  ] ++ lib.optionals stdenv.isDarwin [
+    pkgs.libiconv
+    pkgs.darwin.apple_sdk.frameworks.Security
   ];
 
   # Avoid compiling Nim itself.