cc -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations fcntl/posix_fadvise.c -o fcntl/posix_fadvise -D_POSIX_C_SOURCE=202405L -lm -lpthread -lrt -lintl -liconv
fcntl/posix_fadvise.c:6:38: error: ‘posix_fadvise’ undeclared here (not in a function)
    6 | int (*foo)(int, off_t, off_t, int) = posix_fadvise;
      |                                      ^~~~~~~~~~~~~