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