--- gcc/config/sparc/sysv4.h	2018/04/24 18:10:25	1.1.1.1
+++ gcc/config/sparc/sysv4.h	2018/04/24 18:15:09	1.1.1.2
@@ -52,7 +52,8 @@ the Free Software Foundation, 675 Mass A
    the Sparc running svr4.  __svr4__ is our extension.  */
 
 #define CPP_PREDEFINES \
-  "-Dsparc -Dunix -D__svr4__ -Asystem(unix) -Acpu(sparc) -Amachine(sparc) \
+  "-Dsparc -Dunix -D__svr4__ \
+   -Asystem(unix) -Asystem(svr4) -Acpu(sparc) -Amachine(sparc) \
    -D__GCC_NEW_VARARGS__"
 
 /* The specialized code which needs to appear in the .init section prior