cc -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations sys_stat/S_TYPEISSHM.c -o sys_stat/S_TYPEISSHM -D_POSIX_C_SOURCE=202405L -lm -lpthread -lnetwork -lbsd -latomic
sys_stat/S_TYPEISSHM.c:3:2: error: #error "S_TYPEISSHM is not defined"
    3 | #error "S_TYPEISSHM is not defined"
      |  ^~~~~