cc -pthread   -Wall -Wextra -Werror=implicit-function-declaration mqueue/mq_notify.c -o mqueue/mq_notify -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE -lm -lpthread -lrt  -lintl -liconv
mqueue/mq_notify.c:5:10: fatal error: mqueue.h: No such file or directory
    5 | #include <mqueue.h>
      |          ^~~~~~~~~~
compilation terminated.