cc -pipe -O   -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations sys_shm/SHMLBA.c -o sys_shm/SHMLBA -D_POSIX_C_SOURCE=202405L  -lm -lpthread -lrt  -lrt -lcrypt
In file included from sys_shm/SHMLBA.c:7:
sys_shm/SHMLBA.c:8:17: error: 'PAGE_SIZE' undeclared here (not in a function)
 int const foo = SHMLBA;
                 ^~~~~~