cc -O2 -pipe  -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations sys_resource/RLIMIT_AS.c -o sys_resource/RLIMIT_AS -D_POSIX_C_SOURCE=202405L  -lm -lpthread 
sys_resource/RLIMIT_AS.c:2:17: error: use of undeclared identifier 'RLIMIT_AS'
int const foo = RLIMIT_AS;
                ^
1 error generated.