x86_64-managarm-gcc -pthread   -Wall -Wextra -Werror=implicit-function-declaration mqueue/mq_timedsend.c -o mqueue/mq_timedsend -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE -lm -lpthread -lrt  -lintl -liconv -lintl -liconv
mqueue/mq_timedsend.c: In function ‘main’:
mqueue/mq_timedsend.c:103:14: error: implicit declaration of function ‘mq_timedsend’ [-Wimplicit-function-declaration]
  103 |         if ( mq_timedsend(mq, "foo", 3, 0, &now) < 0 )
      |              ^~~~~~~~~~~~