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diff --git a/src/m/sun3.h b/src/m/sun3.h
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+/* machine description file for Sun 68000's OPERATING SYSTEM version 3
+   (for either 68000 or 68020 systems).  */
+
+#include "sun2.h"
+#undef sun2
+#ifndef sun3
+#define sun3
+#endif
+
+/* The following line tells the configuration script what sort of 
+   operating system this machine is likely to run.
+   USUAL-OPSYS="note"
+
+NOTE-START
+Sun 1, 2 and 3 (-machine=sun1, -machine=sun2, -machine=sun3;
+                -opsystem=bsd4-2 or -opsystem=sunos4)
+
+  Whether you should use sun1, sun2 or sun3 depends on the
+		   VERSION OF THE OPERATING SYSTEM
+  you have.  There are three machine types for different versions of
+  SunOS.  All are derived from Berkeley 4.2, meaning that you should
+  use -opsystem=bsd4-2.  Emacs 17 has run on all of them.  You will
+  need to use sun3 on Sun 2's running SunOS release 3.
+
+  For SunOS release 4 on a Sun 3, use -machine=sun3 and
+  -opsystem=sunos4.  See the file share-lib/SUNBUG for how to solve
+  problems caused by bugs in the "export" version of SunOS 4.
+NOTE-END  */
+
+/* Say that the text segment of a.out includes the header;
+   the header actually occupies the first few bytes of the text segment
+   and is counted in hdr.a_text.  */
+
+#define A_TEXT_OFFSET(HDR) sizeof (HDR)
+
+/* This is the offset of the executable's text, from the start of the file.  */
+
+#define A_TEXT_SEEK(HDR) (N_TXTOFF (hdr) + sizeof (hdr))
+
+/* In case we are using floating point, work together with crt0.c.  */
+
+#ifndef __GNUC__
+#define C_SWITCH_MACHINE -fsoft
+#endif
+
+/* This line is needed if you are linking with X windows
+   and the library xlib was compiled to use the 68881.
+   For maximum cleanliness, don't edit this file;
+   instead, insert this line in config.h.  */
+/* #define START_FILES crt0.o /usr/lib/Mcrt1.o  */