/usr/lib/xemacs-21.4.22/x86_64-linux-gnu/include/s/sunos4-1-4.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 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 | /* Synched up with: FSF 19.31. */
#include "sunos4-1.h"
#if 0
/* XEmacs: FSF 19.31 removes this. Let's just comment it out. */
/* TERMIOS is broken under SunOS??
Someone says: This causes failure in process_send_signal (tcgetattr
loses) and may also cause hanging at Emacs startup when parent is
not a job control shell. */
/* murray@chemical-eng.edinburgh.ac.uk says this works, and avoids
the problem of spurious ^M in subprocess output. */
#undef HAVE_TERMIOS
#endif
#if 0
/* XEmacs: FSF 19.31 mistakenly reenables this. */
/* jik@gza.com says this works now. */
/* The bug that corrupts GNU malloc's memory pool is fixed in SunOS 4.1.3. */
#undef SYSTEM_MALLOC
#endif /* 0 */
/* barrie@calvin.demon.co.uk says memmove is missing. */
#ifndef SYSTEM_MALLOC
#define MEMMOVE_MISSING
#endif
/* A reliable source says this is broken through SunOS 4.1.3 */
/* but not SunOS 4.1.4 */
#ifdef BROKEN_SIGIO
#undef BROKEN_SIGIO
#endif
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