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diff --git a/src/s/dgux4.h b/src/s/dgux4.h
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+/* Definitions file for GNU Emacs running on Data General's DG/UX
+   Release 4.10 and above.
+   Copyright (C) 1996 Free Software Foundation, Inc.
+
+This file is part of GNU Emacs.
+
+GNU Emacs is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Emacs is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Emacs; see the file COPYING.  If not, write to
+the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+/* This file was written by Roderick Schertler <roderick@ibcinc.com>,
+   contact me if you have problems with or comments about running Emacs
+   on dgux.
+
+   A number of things in the older dgux*.h files don't make sense to me,
+   but since I'm relying on memory and I don't have any older dgux
+   systems installed on which to test changes I'm undoing or fixing them
+   here rather than fixing them at the source. */
+
+/* In dgux.h it says "Can't use sys_signal because then etc/server.c
+   would need sysdep.o." and then it #defines signal() to be
+   berk_signal(), but emacsserver.c does `#undef signal' anyway, so that
+   doesn't make sense.
+
+   Further, sys_signal() in sysdep.c already had a special case for
+   #ifdef DGUX, it called berk_signal() explicitly.  I've removed that
+   special case because it also didn't make sense:  All versions of dgux
+   which the dgux*.h headers take into account have POSIX signals
+   (POSIX_SIGNALS is #defined in dgux.h).  The comments in sys_signal()
+   even acknowledged this (saying that the special berk_signal() case
+   wasn't really necessary), they said that sys_signal() was using
+   berk_signal() instead of sigaction() for efficiency.  Since both give
+   reliable signals neither has to be invoked within the handler.  If
+   the efficiency that the comments were talking about is the overhead
+   of setting up the sigaction struct rather than just passing the
+   function pointer in (which is the only efficiency I can think of)
+   then that's a needless optimization, the Emacs sources do better
+   without the special case.
+
+   The following definition will prevent dgux.h from re-defining
+   signal().  I can't just say `#undef signal' after including dgux.h
+   because signal() is already a macro, defined in <sys/signal.h>, and
+   the original definition would be lost. */
+#define NO_DGUX_SIGNAL_REDEF
+
+#include "dgux5-4r3.h"
+
+#define LIBS_DEBUG /* nothing, -lg doesn't exist */
+
+#ifndef NOT_C_CODE
+
+/* dgux.h defines _setjmp() to be sigsetjmp(), but it defines _longjmp
+   to be longjmp() rather than siglongjmp().  Further, it doesn't define
+   jmp_buf, so sigsetjmp() is being called with a jmp_buf rather than a
+   sigjmp_buf, and the buffer is then passed to vanilla longjmp().  This
+   provides a more complete emulation of the Berkeley semantics. */
+
+#include <setjmp.h>
+#undef jmp_buf
+#undef _setjmp
+#undef  setjmp
+#undef _longjmp
+#undef  longjmp
+#define jmp_buf         sigjmp_buf
+#define _setjmp(env)    sigsetjmp(env, 0)
+#define  setjmp(env)    sigsetjmp(env, 1)
+#define _longjmp        siglongjmp
+#define  longjmp        siglongjmp
+
+/* The BAUD_CONVERT definition in dgux.h is wrong with this version
+   of dgux, but I'm not sure when it changed.
+
+   With the current system Emacs' standard handling of ospeed and
+   baud_rate don't work.  The baud values (B9600 and so on) returned by
+   cfgetospeed() aren't compatible with those used by ospeed.  speed_t,
+   the type returned by cfgetospeed(), is unsigned long and speed_t
+   values are large.  Further, it isn't possible to get at both the
+   SysV3 (ospeed) and POSIX (cfgetospeed()) values through symbolic
+   constants simultaneously because they both use the same names
+   (B9600).  To get both baud_rate and ospeed right at the same time
+   it's necessary to hardcode the values for one set of values, here I'm
+   hardcoding ospeed. */
+#undef BAUD_CONVERT
+#define INIT_BAUD_RATE()                                        \
+    struct termios sg;                                          \
+                                                                \
+    tcgetattr (input_fd, &sg);                                  \
+    switch (cfgetospeed (&sg)) {                                \
+    case    B50:        baud_rate =    50; ospeed = 0x1; break; \
+    case    B75:        baud_rate =    75; ospeed = 0x2; break; \
+    case   B110:        baud_rate =   110; ospeed = 0x3; break; \
+    case   B134:        baud_rate =   134; ospeed = 0x4; break; \
+    case   B150:        baud_rate =   150; ospeed = 0x5; break; \
+    case   B200:        baud_rate =   200; ospeed = 0x6; break; \
+    case   B300:        baud_rate =   300; ospeed = 0x7; break; \
+    case   B600:        baud_rate =   600; ospeed = 0x8; break; \
+    default:                                                    \
+    case  B1200:        baud_rate =  1200; ospeed = 0x9; break; \
+    case  B1800:        baud_rate =  1800; ospeed = 0xa; break; \
+    case  B2400:        baud_rate =  2400; ospeed = 0xb; break; \
+    case  B4800:        baud_rate =  4800; ospeed = 0xc; break; \
+    case  B9600:        baud_rate =  9600; ospeed = 0xd; break; \
+    case B19200:        baud_rate = 19200; ospeed = 0xe; break; \
+    case B38400:        baud_rate = 38400; ospeed = 0xf; break; \
+    }                                                           \
+    return;
+
+/* The `stop on tty output' problem which occurs when using
+   INTERRUPT_INPUT and when Emacs is invoked under X11 using a job
+   control shell (csh, ksh, etc.) in the background doesn't look to be
+   present in R4.11.  (At least, I can't reproduce it using jsh, csh,
+   ksh or zsh.) */
+#undef BROKEN_FIONREAD
+#define INTERRUPT_INPUT
+
+/* In R4.11 (or maybe R4.10, I don't have a system with that version
+   loaded) some of the internal stdio semantics were changed.  One I
+   found while working on MH is that _cnt has to be 0 before _filbuf()
+   is called.  Another is that (_ptr - _base) doesn't indicate how many
+   characters are waiting to be sent.  I can't spot a good way to get
+   that info from the FILE internals. */
+#define PENDING_OUTPUT_COUNT(FILE) (1)
+
+#endif /* NOT_C_CODE */