lib/48291: locale::facet::_S_create_c_locale name not valid

[Thomas Klausner <wiz%NetBSD.org@localhost>]

>Number:         48291
>Category:       lib
>Synopsis:       locale::facet::_S_create_c_locale name not valid
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    lib-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Oct 08 13:10:00 +0000 2013
>Originator:     Thomas Klausner
>Release:        NetBSD 6.99.23
>Organization:
>Environment:
Architecture: x86_64
Machine: amd64
>Description:
There seems to be some trouble with C++ and locales.
>How-To-Repeat:
# cd /usr/pkgsrc/net/cclive
# make install
# export LC_CTYPE=de_DE.UTF-8
# cclive
error: locale::facet::_S_create_c_locale name not valid

I've tried around a bit, nothing of the following worked:
en_US.ASCII
en_US
en

Only "C" seems to work, or unsetting the variable.
I haven't seen this issue with other programs, so it might be cclive
specific.
>Fix:
none provided.