error:
       … while evaluating the attribute 'optionalValue.value'
         at «https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.1.1011622%2Brev-a799d3e3886da994fa307f817a6bc705ae538eeb/019ea4be-9303-7001-8232-6b7ec45c4f5b/source.tar.gz?narHash=sha256-3av0pIjlOWQ6rDbNOmpUSvbNnJkGORQKKjb4LtCZsIY%3D»/lib/modules.nix:1332:5:
         1331|
         1332|     optionalValue = if isDefined then { value = mergedValue; } else { };
             |     ^
         1333|   };

       … while evaluating a branch condition
         at «https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.1.1011622%2Brev-a799d3e3886da994fa307f817a6bc705ae538eeb/019ea4be-9303-7001-8232-6b7ec45c4f5b/source.tar.gz?narHash=sha256-3av0pIjlOWQ6rDbNOmpUSvbNnJkGORQKKjb4LtCZsIY%3D»/lib/modules.nix:1332:21:
         1331|
         1332|     optionalValue = if isDefined then { value = mergedValue; } else { };
             |                     ^
         1333|   };

       … while evaluating definitions from `/nix/store/6wa7vry7nvx304rc37yrj6id38dbyd7m-source/builtinModules/packages.nix':

       (stack trace truncated; use '--show-trace' to show the full, detailed trace)

       error: attribute 'sdkroot' missing
       at «https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.1.1011622%2Brev-a799d3e3886da994fa307f817a6bc705ae538eeb/019ea4be-9303-7001-8232-6b7ec45c4f5b/source.tar.gz?narHash=sha256-3av0pIjlOWQ6rDbNOmpUSvbNnJkGORQKKjb4LtCZsIY%3D»/pkgs/stdenv/darwin/default.nix:373:30:
          372|             CC=${bootstrapTools}/bin/clang
          373|             export SDKROOT=${self.apple-sdk.sdkroot}
             |                              ^
          374|           ''