--- gcc/config/rs6000/mach.h	2018/04/24 18:10:26	1.1.1.1
+++ gcc/config/rs6000/mach.h	2018/04/24 18:30:32	1.1.1.3
@@ -17,14 +17,15 @@ GNU General Public License for more deta
 
 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, 675 Mass Ave, Cambridge, MA 02139, USA.  */
+the Free Software Foundation, 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.  */
 
 
 #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"
+#define CPP_PREDEFINES "-Drios -D_IBMR2 -Dunix -Asystem(unix) -Asystem(mach) -Acpu(rs6000) -Amachine(rs6000)"
 
 /* Define different binder options for MACH.  */
 #undef LINK_SPEC