Segfault with LANG=nl_NL, not with LANG=nl_NL.UTF-8

[tjoen]

Is this expected behaviour?

$ LANGUAGE=nl_NL LANG=nl_NL gnucash
[create new file]
Segmentation fault

But
$ LANGUAGE=nl_NL.UTF-8 LANG=nl_NL.UTF-8 gnucash
[doesn't segfault creating new file]

System: Linux x86 LFS-like
gnucash-2.4.7
glibc-2.13 with only:
 localedef -i nl_NL -f ISO-8859-1 nl_NL
 localedef -i nl_NL -f UTF-8 nl_NL.UTF-8
 localedef -i en_US -f UTF-8 en_US.UTF-8

According to the SUPPORTED file from glibc:
 nl_NL.UTF-8/UTF-8 \
 nl_NL/ISO-8859-1 \
 nl_NL at euro/ISO-8859-15 \