gcc -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations unistd/POSIX_CLOSE_RESTART.c -o unistd/POSIX_CLOSE_RESTART -D_POSIX_C_SOURCE=202405L -lm -lpthread -lrt -lxnet -lsocket -latomic
unistd/POSIX_CLOSE_RESTART.c:2:17: error: 'POSIX_CLOSE_RESTART' undeclared here (not in a function)
    2 | int const foo = POSIX_CLOSE_RESTART;
      |                 ^~~~~~~~~~~~~~~~~~~