Couldn't get attributes to build. Error was: warning: ignoring untrusted flake configuration setting 'extra-experimental-features'.
Pass '--accept-flake-config' to trust it
warning: ignoring untrusted flake configuration setting 'extra-substituters'.
Pass '--accept-flake-config' to trust it
warning: ignoring untrusted flake configuration setting 'extra-trusted-public-keys'.
Pass '--accept-flake-config' to trust it
warning: ignoring untrusted flake configuration setting 'registries'.
Pass '--accept-flake-config' to trust it
warning: ignoring untrusted flake configuration setting 'sandbox'.
Pass '--accept-flake-config' to trust it
error:
       … in the left operand of the update (//) operator
         at «nix-internal»/call-flake.nix:66:9:
           65|         # This is shadowed in the next //
           66|         // sourceInfo
             |         ^
           67|         // {

       … in the right operand of the update (//) operator
         at /nix/store/gicm9c9g1nhpqmysx2za8lkiz6x5k8b5-source/flake.nix:167:5:
          166|     }
          167|     // flake-utils.lib.eachSystem supportedSystems (system: let
             |     ^
          168|       pkgs = import nixpkgs {

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

       error: attribute 'defaultSystems' missing
       at /nix/store/gicm9c9g1nhpqmysx2za8lkiz6x5k8b5-source/flake.nix:41:24:
           40|
           41|     supportedSystems = flaky.lib.defaultSystems;
             |                        ^
           42|