Currently fails with:
$ nix --extra-experimental-features 'nix-command flakes' eval .#legacyPackages
error: anonymous function at /nix/store/g5bl53zqkkc6pcr6izsbrhcs1fjkxdhd-source/pkgs/build-support/fetchurl/boot.nix:5:1 called with unexpected argument 'meta'
at /nix/store/g5bl53zqkkc6pcr6izsbrhcs1fjkxdhd-source/pkgs/build-support/fetchzip/default.nix:22:2:
21|
22| (fetchurl (let
| ^
23| tmpFilename =
(use '--show-trace' to show detailed location information)
m1:
nix --extra-experimental-features 'nix-command flakes' build CACHIX_ACTIVATE_TOKEN=... cachix deploy activate ./result