cc -pthread   -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations sys_shm/SHM_RDONLY.c -o sys_shm/SHM_RDONLY -D_POSIX_C_SOURCE=202405L -lm -lpthread  -lgdbm_compat -lintl -lnetwork -lbsd -latomic
sys_shm/SHM_RDONLY.c:7:10: fatal error: sys/shm.h: No such file or directory
    7 | #include <sys/shm.h>
      |          ^~~~~~~~~~~
compilation terminated.