clang -O2  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations dirent/scandir.c -o dirent/scandir -D_POSIX_C_SOURCE=202405L  -lm  -lintl
dirent/scandir.c:5:136: error: use of undeclared identifier 'scandir'
int (*foo)(const char *, struct dirent ***, int (*)(const struct dirent *), int (*)(const struct dirent **, const struct dirent **)) = scandir;
                                                                                                                                       ^
1 error generated.