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diff --git a/gcc/config/rs6000/mach.h b/gcc/config/rs6000/mach.h
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+/* Definitions of target machine for GNU compiler,
+   for IBM RS/6000 running MACH.
+   Copyright (C) 1992 Free Software Foundation, Inc.
+   Contributed by Richard Kenner (kenner@nyu.edu)
+
+This file is part of GNU CC.
+
+GNU CC 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 CC 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 CC; see the file COPYING.  If not, write to
+the Free Software Foundation, 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.  */
+
+#define TARGET_AIX 0
+
+#include "rs6000/rs6000.h"
+
+/* We don't define AIX under MACH; instead we define `unix'.  */
+#undef CPP_PREDEFINES
+#define CPP_PREDEFINES "-Drios -D_IBMR2 -Dunix -Asystem(unix) -Asystem(mach) -Acpu(rs6000) -Amachine(rs6000)"
+
+/* Define different binder options for MACH.  */
+#undef LINK_SPEC
+#define LINK_SPEC \
+ "-T0x10000000 -D0x20000000 -K %{!nostdlib:%{!r*:%{!e*:-e __start}}} \
+  -bnoso -berrmsg -btextro -bhalt:4 -bnodelcsect"
+
+/* MACH doesn't have atexit.  */
+#undef HAVE_ATEXIT
+
+/* Don't default to pcc-struct-return, because gcc is the only compiler, and
+   we want to retain compatibility with older gcc versions.  */
+#define DEFAULT_PCC_STRUCT_RETURN 0