/usr/lib/xemacs-21.4.22/x86_64-linux-gnu/include/s/decosf1-2.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 | /* Synched up with: Not in FSF. */
#define OSF1
#ifndef NOT_C_CODE
#include <sys/param.h>
#endif
#include "bsd4-3.h"
/* Identify OSF1 for the m- files. */
/* Define _BSD to tell the include files we're running under
the BSD universe and not the SYSV universe. */
#ifdef __GNUC__
#define C_SWITCH_SYSTEM "-D_BSD"
#else
#define C_SWITCH_SYSTEM "-std -D_BSD"
#endif
#define LIBS_SYSTEM "-lbsd"
#define SYSTEM_MALLOC
/* This to get rid of the -X that ymakefile inserts */
#undef LD_SWITCH_SYSTEM
#define LD_SWITCH_SYSTEM
/* XEmacs change */
#define GMALLOC_NEEDS_SBRK_DECL
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