copying path '/nix/store/mmwxq59ks0h0yz731sl55f7ng0jxrw0i-openjpeg-2.5.2' from 'https://cache.nixos.org'...
copying path '/nix/store/3zykdvv4pvs0k11z0bgc96wfjnjjzm4p-systemd-minimal-256.8' from 'https://cache.nixos.org'...
copying path '/nix/store/qhr5ish7bi0q1f504ja88vz66d3w5b17-tremor-unstable-2018-03-16' from 'https://cache.nixos.org'...
copying path '/nix/store/bmh1b6hm3qnzm5s0drpimp5ja51f7a71-x265-3.6' from 'https://cache.nixos.org'...
copying path '/nix/store/kb38lzbyzqi0nkwwmqwh6iv5lnlbnarh-ffado-2.4.9' from 'https://cache.nixos.org'...
copying path '/nix/store/plf08zq1lfz4f4x3pghws625bh8ik5f4-cairomm-1.14.5' from 'https://cache.nixos.org'...
copying path '/nix/store/3abwqv1a1bdycmgaydzfw3a0qzxwk8am-systemd-256.8' from 'https://cache.nixos.org'...
copying path '/nix/store/i8r5f1y4kjbigmmlji2hyipm6f8gfaz1-gst-plugins-base-1.24.7' from 'https://cache.nixos.org'...
copying path '/nix/store/1yg87y53lwkg1a0lz9201a3x3dm1d593-librsvg-2.58.3' from 'https://cache.nixos.org'...
copying path '/nix/store/ajipkp1jgxdqa2rja90z1iq6ddwc1xjz-libinput-1.26.2' from 'https://cache.nixos.org'...
copying path '/nix/store/s64qr9jj6acrqxrgas1y6v17gavrgi3k-pangomm-2.46.4' from 'https://cache.nixos.org'...
copying path '/nix/store/840xr1020qsnhn8v6x6bljpymfwanqfq-bluez-5.78' from 'https://cache.nixos.org'...
copying path '/nix/store/z38p9d5m5vziza03j7w834f7z4ypjxbw-libpulseaudio-17.0' from 'https://cache.nixos.org'...
copying path '/nix/store/p0zk89fh134qn4y1d1s50cik65n2pby9-cups-2.4.11-lib' from 'https://cache.nixos.org'...
copying path '/nix/store/vy0f3qff59zimb9y6yjl41xygqppjbfh-tinysparql-3.8.0' from 'https://cache.nixos.org'...
copying path '/nix/store/9vxf8c65vbk7ppkad9412a045pgq8sp0-portaudio-190700_20210406' from 'https://cache.nixos.org'...
copying path '/nix/store/q3nk8nbzkj173fdw0nc8wajdq764w4xk-libao-1.2.2' from 'https://cache.nixos.org'...
copying path '/nix/store/79r8dm8bg6bzd106jl3n3dzg9lmmfsxx-sox-unstable-2021-05-09-lib' from 'https://cache.nixos.org'...
copying path '/nix/store/fjjlggnbj8ivfmz9vz0v9lh6jrfkp04a-roc-toolkit-0.4.0' from 'https://cache.nixos.org'...
copying path '/nix/store/p9by83s8h6nrmvmimpl8zkyjn5dvwjyl-ffmpeg-headless-7.1-lib' from 'https://cache.nixos.org'...
copying path '/nix/store/879455nc7zqyf983xq0zz1vicgq93vy4-libcamera-0.3.2' from 'https://cache.nixos.org'...
copying path '/nix/store/8cw08cgb87bpyzbqrk9pwb1fj7lfyxql-gtk+3-3.24.43' from 'https://cache.nixos.org'...
copying path '/nix/store/fi8q32kj3m5hn1fznfif13092v7czx01-gtkmm-3.24.9' from 'https://cache.nixos.org'...
copying path '/nix/store/mnl63v4lpggalz091sbhfxcy3cqffr6f-SDL2-2.30.6' from 'https://cache.nixos.org'...
copying path '/nix/store/ng9wm7zqgxlymgqfx455b6i119sc3rdq-wireplumber-0.5.7' from 'https://cache.nixos.org'...
copying path '/nix/store/fdsjj3qa9qc3zzyzrqafvl12skx18hby-waybar-0.11.0' from 'https://cache.nixos.org'...
unpacking 'github:oxalica/rust-overlay/a0b81d4fa349d9af1765b0f0b4a899c13776f706?narHash=sha256-IKrk7RL%2BQ/2NC6%2BQl6dwwCNZI6T6JH2grTdJaVWHF0A%3D' into the Git cache...
error:
       … while calling the 'head' builtin
         at /nix/store/rfidw50bwmp9by3zlc17jgfwv2zp4896-source/lib/attrsets.nix:1574:11:
         1573|         || pred here (elemAt values 1) (head values) then
         1574|           head values
             |           ^
         1575|         else

       … while evaluating the attribute 'value'
         at /nix/store/rfidw50bwmp9by3zlc17jgfwv2zp4896-source/lib/modules.nix:846:9:
          845|     in warnDeprecation opt //
          846|       { value = addErrorContext "while evaluating the option `${showOption loc}':" value;
             |         ^
          847|         inherit (res.defsFinal') highestPrio;

       … while evaluating the option `system.build.toplevel':

       … while evaluating definitions from `/nix/store/rfidw50bwmp9by3zlc17jgfwv2zp4896-source/nixos/modules/system/activation/top-level.nix':

       … while evaluating the option `warnings':

       … while evaluating definitions from `/nix/store/rfidw50bwmp9by3zlc17jgfwv2zp4896-source/nixos/modules/system/boot/systemd.nix':

       … while evaluating the option `systemd.services.unattended-installer.serviceConfig':

       … while evaluating definitions from `/nix/store/rfidw50bwmp9by3zlc17jgfwv2zp4896-source/nixos/modules/system/boot/systemd.nix':

       … while evaluating the option `systemd.services.unattended-installer.script':

       … while evaluating definitions from `/nix/store/rfidw50bwmp9by3zlc17jgfwv2zp4896-source/flake.nix':

       … while evaluating the option `system.build.toplevel':

       … while evaluating definitions from `/nix/store/rfidw50bwmp9by3zlc17jgfwv2zp4896-source/nixos/modules/system/activation/top-level.nix':

       … while evaluating the option `system.systemBuilderArgs':

       … while evaluating definitions from `/nix/store/rfidw50bwmp9by3zlc17jgfwv2zp4896-source/nixos/modules/system/activation/activatable-system.nix':

       … while evaluating the option `system.activationScripts.etc.text':

       … while evaluating definitions from `/nix/store/rfidw50bwmp9by3zlc17jgfwv2zp4896-source/nixos/modules/system/etc/etc-activation.nix':

       … while evaluating definitions from `/nix/store/rfidw50bwmp9by3zlc17jgfwv2zp4896-source/nixos/modules/system/etc/etc.nix':

       … while evaluating the option `environment.etc.dbus-1.source':

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

       error: Package ‘Affinity Photo 2’ in /nix/store/kxvw2dp30hgaks4pmwvsc06rx356y676-source/scripts.nix:52 has an unfree license (‘unfree’), refusing to evaluate.

       a) To temporarily allow unfree packages, you can use an environment variable
          for a single invocation of the nix tools.

            $ export NIXPKGS_ALLOW_UNFREE=1

          Note: When using `nix shell`, `nix build`, `nix develop`, etc with a flake,
                then pass `--impure` in order to allow use of environment variables.

       b) For `nixos-rebuild` you can set
         { nixpkgs.config.allowUnfree = true; }
       in configuration.nix to override this.

       Alternatively you can configure a predicate to allow specific packages:
         { nixpkgs.config.allowUnfreePredicate = pkg: builtins.elem (lib.getName pkg) [
             "Affinity Photo 2"
           ];
         }

       c) For `nix-env`, `nix-build`, `nix-shell` or any other Nix command you can add
         { allowUnfree = true; }
       to ~/.config/nixpkgs/config.nix.