ftp.nice.ch/pub/next/developer/nextsources/Pre3.X/emacs-15.0.3.s.tar.gz#/emacs-15.0.3/src/x11term.h

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#include <X11/Xlib.h>
#include <X11/Xatom.h>
#include <X11/keysym.h>
#include <X11/cursorfont.h>
#include <X11/Xutil.h>
#include <X11/X10.h>

#define XMOUSEBUFSIZE 64

#ifndef sigmask
#define sigmask(no) (1L << ((no) - 1))
#endif

#define BLOCK_INPUT_DECLARE() int BLOCK_INPUT_mask
#ifdef SIGIO
#define BLOCK_INPUT() BLOCK_INPUT_mask = sigblock (sigmask (SIGIO))
#define UNBLOCK_INPUT() sigsetmask (BLOCK_INPUT_mask)
#else /* not SIGIO */
#define BLOCK_INPUT()
#define UNBLOCK_INPUT()
#endif /* SIGIO */

#define CLASS  "emacs"	/* class id for GNU Emacs, used in .Xdefaults, etc. */

These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.