Message        The call iconv_open(<CODESET>, "UCS-4") failed
                because:  <STRERROR>.  UCNs will not be mapped to the
                native character set.

 Description    To translate Universal Character Name escape
                sequences to the codeset of the current locale, the
                compiler needs to call the iconv_open library routine
                with the specified parameters.  This call failed, for
                the reason shown.  Thus no UCN escape sequences in
                this program can be translated.

 User Action    Make sure your system has the specified codeset
                converter installed, or set your locale to use a
                codeset for which a converter from UCS-4 is
                available.  Alternatively, change your code to avoid
                the use of UCNs, e.g.  using hexadecimal escape
                sequences.