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  -lgdbm_compat -lintl -lnetwork -lbsd -latomic
iconv/iconv_close.c:1:10: fatal error: iconv.h: No such file or directory
    1 | #include <iconv.h>
      |          ^~~~~~~~~
compilation terminated.