i cannot compile enca with libiconv

[oahcy]

i configure enca with command:./configure --with-libiconv=/usr/local/ becase my iconv header in /usr/local/include/iconv.h and lib in /usr/local/lib/libiconv.so but this not work error is: checking for iconv... yes checking for working iconv... no checking for iconv declaration... extern size_t iconv (iconv_t cd, char * *inbuf, size_t *inbytesleft, char * *outbuf, size_t *outbytesleft); checking whether iconv implementation is usable... no