/usr/lib/xemacs-21.4.22/x86_64-linux-gnu/include/s/usg5-4-2.h is in xemacs21-bin 21.4.22-4ubuntu3.
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 | /* Synched up with: FSF 19.31. */
/* s/ file for System V release 4.2. */
#include "usg5-4.h"
/* Motif needs -lgen. */
#undef LIBS_SYSTEM
#define LIBS_SYSTEM "-lsocket -lnsl -lelf -lgen"
#define VFORK_RETURN_TYPE pid_t
/* XEmacs change (since getwd is auto-determined) */
#undef HAVE_GETWD /* (appears to be buggy on SVR4.2) */
/* XEmacs change: communicate to m/intel386.h */
#define USG5_4_2
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