the definition of the iconv (3) function is wrong, FreeBSD appears to adhere to
the gnu iconv http://www.gnu.org/software/libiconv/documentation/libiconv/iconv.3.html

while the opengroup

http://www.opengroup.org/onlinepubs/009695399/functions/iconv.html

specifies it to: size_t iconv(iconv_t cd, char **restrict inbuf, size_t *restrict inbytesleft, char **restrict outbuf, size_t *restrict outbytesleft);

notice how the definition of the second parameter is not (const char**).