There’s no actual error message here. Could you look for the full log
under /nix/var/log/nix/drvs, and check if there’s an error message
somewhere above? (It may have been built with ‘make -jX’, so the output
is intermingled.)
> x86_64 architecture
Normally it should be using pre-compiled binaries from hydra.gnu.org by
default.
What do you have in /nix/var/nix/substitute-binary/cache?