$ nix flake check
error: a 'x86_64-darwin' with features {} is required to build '/nix/store/7qy2k5adsj1rlgwpxnr0mhv4b5l6s3c3-cabal2nix-monad-bayes.drv', but I am a 'x86_64-linux' with features {benchmark, big-parallel, kvm, nixos-test}