Disabled for now - enable if we want c++ as the default C++ compiler.
diff -u -r ../make-4.1/default.c ./default.c
--- ../make-4.1/default.c	2014-10-05 12:24:51.000000000 -0400
+++ ./default.c	2016-05-02 17:35:39.128123074 -0400
@@ -447,7 +447,7 @@
     "OBJC", "gcc",
 #else
     "CC", "cc",
-    "CXX", "g++",
+    "CXX", "c++",
     "OBJC", "cc",
 #endif