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diff --git a/src/m/sun3-68881.h b/src/m/sun3-68881.h
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+++ b/src/m/sun3-68881.h
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+/* sun3-68881.h, for a Sun 3, using the 68881.  */
+
+#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 68881 co-processor (-machine=sun3-68881;
+			     -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.
+
+  For SunOS release 4 on a Sun 3 with a 68881, 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 -f68881
+#endif
+
+#define sun_68881
+#define START_FILES crt0.o /usr/lib/Mcrt1.o