/usr/lib/xemacs-21.4.22/x86_64-linux-gnu/include/s/386-ix.h is in xemacs21-bin 21.4.22-14~deb8u1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 | /* Synched up with: FSF 19.31. */
/* Interactive 386/ix. */
#include "usg5-3.h"
#define BROKEN_TIOCGETC
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