> What should I do then to test it?  I mean, is it all already in the system or
> must I download and install any extra library and other system components (as
> said in CITRUS' website)?  What is the API to use?  If it follows a standard,
> what is it?

If you're using -current, its in /usr/lib/libc.*,
/usr/lib/runemodule/*, and relevant headers.  setlocale(3) and
localeconv(3) conform to ANSI X3.159-1989 (``ANSI C'') and ISO/IEC
9899:1990 (``ISO C90'') due to the manual page of setlocale(3).

Regards,
Masao