The only thing with in an error in that part of the message is the one that says collect2: error: ld returned with exit status 1,the really generic gcc linker error.
The actual directory name depends on your --localstatedir or --prefix
option passed to ‘configure’. Can you check the value of
‘localstatedir’ in the config.log file?
It was hiding in /usr/local/var/nix, but unfortunately there's also no substitute-binaries dir in there either!