cc -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations stdlib/getsubopt.c -o stdlib/getsubopt -D_POSIX_C_SOURCE=202405L -lm -lpthread -lrt -lintl -liconv
stdlib/getsubopt.c:5:71: error: ‘getsubopt’ undeclared here (not in a function)
    5 | int (*foo)(char **restrict, char *const *restrict, char **restrict) = getsubopt;
      |                                                                       ^~~~~~~~~