CC       rtapelib.o
In file included from /usr/include/sys/socket.h:33,
                 from /usr/include/netinet/in.h:23,
                 from /usr/include/netdb.h:27,
                 from rtapelib.c:59:
/usr/include/bits/socket.h: In function ‘__cmsg_nxthdr’:
/usr/include/bits/socket.h:315:12: error: cast increases required alignment of target type [-Werror=cast-align]
   __cmsg = (struct cmsghdr *) ((unsigned char *) __cmsg
            ^
rtapelib.c: In function ‘rmt_ioctl__’:
rtapelib.c:675:18: error: cast increases required alignment of target type [-Werror=cast-align]
  uintmax_t u = (((struct mtop *) argument)->mt_count < 0
                  ^
rtapelib.c:676:27: error: cast increases required alignment of target type [-Werror=cast-align]
          ? - (uintmax_t) ((struct mtop *) argument)->mt_count
                           ^
rtapelib.c:677:25: error: cast increases required alignment of target type [-Werror=cast-align]
          : (uintmax_t) ((struct mtop *) argument)->mt_count);
                         ^
rtapelib.c:684:7: error: cast increases required alignment of target type [-Werror=cast-align]
  if (((struct mtop *) argument)->mt_count < 0)
       ^
rtapelib.c:690:5: error: cast increases required alignment of target type [-Werror=cast-align]
    ((struct mtop *) argument)->mt_op, p);
     ^
rtapelib.c:735:7: error: cast increases required alignment of target type [-Werror=cast-align]
  if (((struct mtget *) argument)->MTIO_CHECK_FIELD < 256)
       ^