cc -pthread  -Wall -Wextra -Werror=implicit-function-declaration semaphore/sem_close.c -o semaphore/sem_close -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE -lm -lpthread -lrt -lintl -liconv
semaphore/sem_close.c: In function ‘main’:
semaphore/sem_close.c:19:30: error: implicit declaration of function ‘sem_open’ [-Wimplicit-function-declaration]
   19 |                 sem_t* sem = sem_open(path, O_CREAT | O_EXCL, 0600, 1);
      |                              ^~~~~~~~
semaphore/sem_close.c:19:30: error: initialization of ‘sem_t *’ from ‘int’ makes pointer from integer without a cast [-Wint-conversion]
semaphore/sem_close.c:27:22: error: implicit declaration of function ‘sem_close’; did you mean ‘sem_post’? [-Wimplicit-function-declaration]
   27 |                 if ( sem_close(sem) < 0 )
      |                      ^~~~~~~~~
      |                      sem_post
semaphore/sem_close.c:32:17: error: implicit declaration of function ‘sem_unlink’; did you mean ‘symlink’? [-Wimplicit-function-declaration]
   32 |                 sem_unlink(path);
      |                 ^~~~~~~~~~
      |                 symlink