--- gcc/config/mips-svr4.h	2018/04/24 17:55:24	1.1
+++ gcc/config/mips-svr4.h	2018/04/24 18:00:23	1.1.1.2
@@ -46,4 +46,25 @@ the Free Software Foundation, 675 Mass A
 
 #define MACHINE_TYPE "RISC-OS System V.4 Mips"
 
+/* Override defaults for finding the MIPS tools.  */
+#define MD_STARTFILE_PREFIX "/svr4/usr/lib/cmplrs/cc/"
+#define MD_EXEC_PREFIX "/svr4/usr/lib/cmplrs/cc/"
+
+/* Mips System V.4 doesn't have a getpagesize() function needed by the
+   trampoline code, so use the POSIX sysconf function to get it.
+   This is only done when compiling the trampoline code.  */
+
+#ifdef  L_trampoline
+#include <unistd.h>
+
+#define getpagesize()	sysconf(_SC_PAGE_SIZE)
+#endif /*  L_trampoline */
+
+/* Use atexit for static constructors/destructors, instead of defining
+   our own exit function.  */
+#define HAVE_ATEXIT
+
+/* Generate calls to memcpy, etc., not bcopy, etc.  */
+#define TARGET_MEM_FUNCTIONS
+
 #include "mips.h"