cc -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations iconv/iconv.c -o iconv/iconv -D_POSIX_C_SOURCE=202405L -lm -lpthread -lrt -lintl -liconv
iconv/iconv.c:5:96: error: ‘iconv’ undeclared here (not in a function); did you mean ‘iconv_t’?
    5 | size_t (*foo)(iconv_t, char **restrict, size_t *restrict, char **restrict, size_t *restrict) = iconv;
      |                                                                                                ^~~~~
      |                                                                                                iconv_t