--- gcc/config/mips/x-iris	2018/04/24 18:21:52	1.1.1.2
+++ gcc/config/mips/x-iris	2018/04/24 18:29:27	1.1.1.3
@@ -25,4 +25,4 @@ CLIB		= -lmld -lmalloc
 ALLOCA		= alloca.o
 
 # Find all of the declarations from the header files
-FIXPROTO_DEFINES= -D__EXTENSIONS__
+FIXPROTO_DEFINES= -D__EXTENSIONS__ -D_LANGUAGE_C_PLUS_PLUS