cc -pthread  -Wall -Wextra -Werror=implicit-function-declaration dirent/posix_getdents.c -o dirent/posix_getdents -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE -lm -lpthread -lrt -lcrypt -latomic
dirent/posix_getdents.c: In function ‘main’:
dirent/posix_getdents.c:20:30: error: invalid application of ‘sizeof’ to incomplete type ‘struct posix_dent’
   20 |         size_t size = sizeof(struct posix_dent) + name_max + 1;
      |                              ^~~~~~
dirent/posix_getdents.c:26:31: error: implicit declaration of function ‘posix_getdents’ [-Wimplicit-function-declaration]
   26 |         while ( 0 < (amount = posix_getdents(fd, buffer, size, 0)) )
      |                               ^~~~~~~~~~~~~~
dirent/posix_getdents.c:32:43: error: invalid use of undefined type ‘struct posix_dent’
   32 |                         if ( !strcmp(entry->d_name, "dirent") )
      |                                           ^~
dirent/posix_getdents.c:34:40: error: invalid use of undefined type ‘struct posix_dent’
   34 |                         offset += entry->d_reclen;
      |                                        ^~