cc -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations stdlib/O_RSYNC.c -o stdlib/O_RSYNC -D_POSIX_C_SOURCE=202405L -lm -lpthread -lrt -lintl -lcrypt -latomic
stdlib/O_RSYNC.c:3:17: error: 'O_RSYNC' undeclared here (not in a function)
    3 | int const foo = O_RSYNC;
      |                 ^~~~~~~