cc -O2 -pipe -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations mqueue/O_RDONLY.c -o mqueue/O_RDONLY -D_POSIX_C_SOURCE=202405L  -lm -lpthread -lrt  -lstdthreads -lcrypt
mqueue/O_RDONLY.c:4:2: error: "O_RDONLY is not defined"
    4 | #error "O_RDONLY is not defined"
      |  ^
1 error generated.