gcc -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations stdlib/O_DSYNC.c -o stdlib/O_DSYNC -D_POSIX_C_SOURCE=202405L -lm -lpthread -lrt -lxnet -lsocket -latomic
stdlib/O_DSYNC.c:3:17: error: ‘O_DSYNC’ undeclared here (not in a function)
    3 | int const foo = O_DSYNC;
      |                 ^~~~~~~