cc -pipe -O   -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations sys_shm/SHM_FAILED.c -o sys_shm/SHM_FAILED -D_POSIX_C_SOURCE=202405L  -lm -lpthread -lrt  -lrt -lcrypt
sys_shm/SHM_FAILED.c:8:20: error: 'SHM_FAILED' undeclared here (not in a function); did you mean 'SHM_RND'?
 void * const foo = SHM_FAILED;
                    ^~~~~~~~~~
                    SHM_RND