Now I am seeing:

# guix pull
guix ... adfb167
...
substitute: updating substitutes from 'https://mirror.hydra.gnu.org'... 100.0%
building /gnu/store/abm71vz51xi6b3s5l0yqxr8i22yfzyam-guix-manual.drv...
sh: locale: command not found
sh: locale: command not found
sh: locale: command not found