clang -O2  -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  -lintl
sys_stat/S_TYPEISSHM.c:3:2: error: "S_TYPEISSHM is not defined"
#error "S_TYPEISSHM is not defined"
 ^
1 error generated.