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diff --git a/src/m/sun3-soft.h b/src/m/sun3-soft.h
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+/* sun3-soft.h, for a Sun 3, using the Sun with software floating point.  */
+
+#include "sun3.h"
+
+/* The following line tells the configuration script what sort of 
+   operating system this machine is likely to run.
+   USUAL-OPSYS="note"
+
+NOTE-START
+Sun with software floating point (-machine=sun3-soft;
+			          -opsystem=bsd4-2 or -opsystem=sunos4)
+
+  Versions 1, 2, and 3 of the operating system are derived from
+  Berkeley 4.2, meaning that you should use -opsystem=bsd4-2.
+
+  If you want to use software floating point on SunOS release 4 on a
+  Sun 3, use -machine=sun3-68881 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  */
+
+/* In case we are using floating point, work together with crt0.c.  */
+
+#ifndef __GNUC__
+#define C_SWITCH_MACHINE -fsoft
+#endif
+
+#define sun_soft
+#define START_FILES crt0.o /usr/lib/Fcrt1.o