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/usr/i686-linux-gnu/include/termio.h is in libc6-dev-i386-cross 2.27-3ubuntu1cross1.

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/* Compatible <termio.h> for old `struct termio' ioctl interface.
   This is obsolete; use the POSIX.1 `struct termios' interface
   defined in <termios.h> instead.  */

#include <termios.h>
#include <sys/ioctl.h>