and then try again, with:

  ./pre-inst-env guix package -i autoconf

(I can provided more info on how to apply the patch if needed.  See also
<http://www.gnu.org/software/guix/manual/html_node/Running-Guix-Before-It-Is-Installed.html>.)

This may be a regression introduced in 279ec1d.

TIA!

Ludo’.