Hello,

This may not be a bug, but I am still confused as to how to fix, this. 

`guix environment --container --ad-hoc glibc-utf8-locales tmux`

gives `guix environment: error: glibc-utf8-locales: unknown package`

`guix install glibc-utf8-locales-2.29 tmux`

and 

`guix environment --container --ad-hoc glibc-utf8-locales-2.29 tmux`

give

```

substitute: updating substitutes from 'https://ci.guix.gnu.org'... 100.0%

  /gnu/store/sixsjzjqp0jp02i651sb8chkr82l1f84-profile.drv

...

```

```

export GUIX_LOCPATH=$GUIX_ENVIRONMENT/lib/locale

tmux

```

gives

`tmux: need UTF-8 locale (LC_CTYPE) but have ANSI_X3.4-1968`

Let me know how to proceed please?

Thanks,

mike