how to set language for non-unicode text

[Han <keepsimple gmail com>]

Hi,

I wrote my first linux GUI app using GTK+, which seems to be a very
nice tool.  One question I had is: how can I set the language for
non-unicode text in my application?  I tried to use iconv(), but did
not work out. The iconv_open call returned error ENOENT (2).  Not sure
if i am in the correct direction.

thanks for any help.