structuredAttrs is enabled

trying https://github.com/unreallabsai/unreal-agent/archive/refs/tags/v0.1.1.tar.gz
  % Total    % Received % Xferd  Average Speed  Time    Time    Time   Current
                                 Dload  Upload  Total   Spent   Left   Speed

  0      0   0      0   0      0      0      0                              0
  0      0   0      0   0      0      0      0                              0
  0      0   0      0   0      0      0      0                              0

  0      0   0      0   0      0      0      0                              0
100 851.5k   0 851.5k   0      0  1.44M      0                              0
100 851.5k   0 851.5k   0      0  1.44M      0                              0
100 851.5k   0 851.5k   0      0  1.44M      0                              0
unpacking source archive /nix/var/nix/builds/nix-94435-3159674930/download.tar.gz