[Arch Linux] locale.conf LANG=en_US.UTF-8

[bwrsandman]

Recently, Arch users have been urged to move their settings out of /etc/rc.conf and into several files.
One such file is /etc/locale.conf the example they provide is to set LANG="en_US.UTF-8".
What I find is that particular setting causes issues with openmw.

Here are my locale settings:

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# locale
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_US.UTF-8"
LC_TIME="en_US.UTF-8"
LC_COLLATE=C
LC_MONETARY="en_US.UTF-8"
LC_MESSAGES="en_US.UTF-8"
LC_PAPER="en_US.UTF-8"
LC_NAME="en_US.UTF-8"
LC_ADDRESS="en_US.UTF-8"
LC_TELEPHONE="en_US.UTF-8"
LC_MEASUREMENT="en_US.UTF-8"
LC_IDENTIFICATION="en_US.UTF-8"
LC_ALL=

These settings don't run well with openmw:

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# openmw

ERROR: locale::facet::_S_create_c_locale name not valid

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# omwlauncher 
terminate called after throwing an instance of 'std::runtime_error'
  what():  locale::facet::_S_create_c_locale name not valid
Aborted

The way to avoid this is to set LANG=C in either one of the following ways:

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# LANG=C openmw
# export LANG=C && openmw

or to have "LANG=C" in your /etc/locale.conf file.

This seems to be a boost related bug. My version is boost 1.50.0-2