cc -pipe -O   -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations stdlib/O_CLOEXEC.c -o stdlib/O_CLOEXEC -D_POSIX_C_SOURCE=202405L  -lm -lpthread -lrt  -lrt -lcrypt
stdlib/O_CLOEXEC.c:2:17: error: 'O_CLOEXEC' undeclared here (not in a function)
 int const foo = O_CLOEXEC;
                 ^~~~~~~~~