cc -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations iconv/iconv_close.c -o iconv/iconv_close -D_POSIX_C_SOURCE=202405L -lm -lpthread -lrt -lintl -liconv
iconv/iconv_close.c:5:23: error: ‘iconv_close’ undeclared here (not in a function); did you mean ‘libiconv_close’?
    5 | int (*foo)(iconv_t) = iconv_close;
      |                       ^~~~~~~~~~~
      |                       libiconv_close