cc -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations mqueue/O_NONBLOCK.c -o mqueue/O_NONBLOCK -D_POSIX_C_SOURCE=202405L  -lm -lpthread  -liconv
mqueue/O_NONBLOCK.c:2:10: fatal error: 'mqueue.h' file not found
    2 | #include <mqueue.h>
      |          ^~~~~~~~~~
1 error generated.