toolchain/53529: boost does not like my locale again

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

>Number:         53529
>Category:       toolchain
>Synopsis:       boost does not like my locale again
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    toolchain-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Aug 16 12:40:00 +0000 2018
>Originator:     Thomas Klausner
>Release:        NetBSD 8.99.24
>Organization:
Curiosity is the very basis of education and if you tell me that 
curiosity killed the cat, I say only that the cat died nobly.
- Arnold Edinborough
>Environment:
	
	
Architecture: x86_64
Machine: amd64
>Description:
For some time I had seen

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

when starting programs using boost (like gnucash); then it stopped
with a boost update, but another recent update brought it back. (I'm pretty
sure it was around 1.67.0).

pkgsrc compiled using gcc in case it matters,
# env | grep -e LC -e LANG
LC_CTYPE=de_AT.UTF-8
LC_TIME=de_AT.UTF-8

Perhaps it's a boost package bug instead?
See also PR 48291.
>How-To-Repeat:
# gnucash

>Fix:
Not known.

Workaround:
# unset LC_CTYPE
# unset LC_TIME
# gnucash

>Unformatted: