structuredAttrs is enabled

trying https://github.com/libunwind/libunwind/archive/v1.8.3.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
100 513.7k   0 513.7k   0      0 801.3k      0                              0
unpacking source archive /build/download.tar.gz