cc -pthread  -Wall -Wextra -Werror=implicit-function-declaration sys_mman/shm_open.c -o sys_mman/shm_open -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE -lm -lpthread -lrt -lintl -liconv
sys_mman/shm_open.c: In function ‘cleanup’:
sys_mman/shm_open.c:18:17: error: implicit declaration of function ‘shm_unlink’; did you mean ‘symlink’? [-Wimplicit-function-declaration]
   18 |                 shm_unlink(temporary);
      |                 ^~~~~~~~~~
      |                 symlink
sys_mman/shm_open.c: In function ‘main’:
sys_mman/shm_open.c:44:22: error: implicit declaration of function ‘shm_open’ [-Wimplicit-function-declaration]
   44 |                 fd = shm_open(shm_name, O_RDWR | O_CREAT | O_EXCL, 0600);
      |                      ^~~~~~~~