Error message running slrn in luit for ISO-8859-1 locale.

[Adam Funk]

With this alias

alias slrn='LANG=en_GB.iso88591   luit -encoding ISO-8859-1 sh -c "sleep 1; slrn"'

and the output of `locale -a` including the following (and some
others)

C
en_GB.iso88591
en_GB.iso885915
en_GB.utf8
POSIX

running slrn (through the alias) always produces this warning

Warning: couldn't find charset data for locale en_GB.iso88591; using ISO 8859-1.


This used to work without the warning, but I recently had to reinstall
my system on a new hard drive and I may not have configured everything
the same.  In particular, I think I had to use localedef to force
creation of the en_GB.iso88591 and en_GB.iso885915 locales.

What does this mean?  Do I care?  How do I fix it?

Thanks,
Adam