x86_64-managarm-gcc -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations mqueue/mq_send.c -o mqueue/mq_send -D_POSIX_C_SOURCE=202405L -lm -lpthread -lrt -lintl -liconv
mqueue/mq_send.c:6:33: error: unknown type name ‘size_t’
    6 | int (*foo)(mqd_t, const char *, size_t, unsigned) = mq_send;
      |                                 ^~~~~~
mqueue/mq_send.c:3:1: note: ‘size_t’ is defined in header ‘<stddef.h>’; this is probably fixable by adding ‘#include <stddef.h>’
    2 | #include <mqueue.h>
  +++ |+#include <stddef.h>
    3 | #ifdef mq_send