clang -O2  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations sys_shm/SHMLBA.c -o sys_shm/SHMLBA -D_POSIX_C_SOURCE=202405L  -lm  -lintl
sys_shm/SHMLBA.c:8:17: error: initializer element is not a compile-time constant
int const foo = SHMLBA;
                ^~~~~~
/usr/include/sys/shm.h:94:17: note: expanded from macro 'SHMLBA'
#define SHMLBA          (__sysconf(28))
                        ^~~~~~~~~~~~~~~
1 error generated.