Locales on NixOS

[Andy Wingo]

Hi,

On one machine I have a NixOS system install and a Guix user install.
The specified recipe to set LOCPATH doesn't work for me there for some
reason.  I can't figure out why, the strace didn't show anything
obvious.

                                       locale from NixOS    locale from guix
  -----------------------------------+--------------------+-----------------
  LOCPATH unset                      | (1)                | (3)
  LOCPATH=~/.guix-profile/lib/locale | (2)                | (4)

This NixOS is the latest stable release and has glibc 2.20.  Guix is
from master and has glibc 2.21.

(1)
LANG=en_US.UTF-8
LC_CTYPE="en_US.UTF-8"
LC_NUMERIC=en_GB.utf8
LC_TIME=en_GB.utf8
LC_COLLATE="en_US.UTF-8"
LC_MONETARY=en_GB.utf8
LC_MESSAGES="en_US.UTF-8"
LC_PAPER=en_GB.utf8
LC_NAME="en_US.UTF-8"
LC_ADDRESS="en_US.UTF-8"
LC_TELEPHONE="en_US.UTF-8"
LC_MEASUREMENT=en_GB.utf8
LC_IDENTIFICATION="en_US.UTF-8"
LC_ALL=

(2)
/run/current-system/sw/bin/locale: Cannot set LC_ALL to default locale: No such 
file or directory
LANG=en_US.UTF-8
LC_CTYPE="en_US.UTF-8"
LC_NUMERIC=en_GB.utf8
LC_TIME=en_GB.utf8
LC_COLLATE="en_US.UTF-8"
LC_MONETARY=en_GB.utf8
LC_MESSAGES="en_US.UTF-8"
LC_PAPER=en_GB.utf8
LC_NAME="en_US.UTF-8"
LC_ADDRESS="en_US.UTF-8"
LC_TELEPHONE="en_US.UTF-8"
LC_MEASUREMENT=en_GB.utf8
LC_IDENTIFICATION="en_US.UTF-8"
LC_ALL=

(3)
locale: Cannot set LC_CTYPE to default locale: No such file or directory
locale: Cannot set LC_MESSAGES to default locale: No such file or directory
locale: Cannot set LC_ALL to default locale: No such file or directory
LANG=en_US.UTF-8
LC_CTYPE="en_US.UTF-8"
LC_NUMERIC=en_GB.utf8
LC_TIME=en_GB.utf8
LC_COLLATE="en_US.UTF-8"
LC_MONETARY=en_GB.utf8
LC_MESSAGES="en_US.UTF-8"
LC_PAPER=en_GB.utf8
LC_NAME="en_US.UTF-8"
LC_ADDRESS="en_US.UTF-8"
LC_TELEPHONE="en_US.UTF-8"
LC_MEASUREMENT=en_GB.utf8
LC_IDENTIFICATION="en_US.UTF-8"
LC_ALL=

(4)
locale: Cannot set LC_ALL to default locale: No such file or directory
LANG=en_US.UTF-8
LC_CTYPE="en_US.UTF-8"
LC_NUMERIC=en_GB.utf8
LC_TIME=en_GB.utf8
LC_COLLATE="en_US.UTF-8"
LC_MONETARY=en_GB.utf8
LC_MESSAGES="en_US.UTF-8"
LC_PAPER=en_GB.utf8
LC_NAME="en_US.UTF-8"
LC_ADDRESS="en_US.UTF-8"
LC_TELEPHONE="en_US.UTF-8"
LC_MEASUREMENT=en_GB.utf8
LC_IDENTIFICATION="en_US.UTF-8"
LC_ALL=

In all cases glibc-locales and glibc are installed.  What am I doing
wrong?  The settings ultimately come from GNOME's chooser thing, so
dunno what's up there but they should be fine.  Only (1) is a success.

Andy