Index: lib/Frontend/InitHeaderSearch.cpp
===================================================================
--- lib/Frontend/InitHeaderSearch.cpp	(revision 112811)
+++ lib/Frontend/InitHeaderSearch.cpp	(working copy)
@@ -195,6 +195,8 @@
           System, true, false, false);
   AddPath(Base + "/" + Arch + "/" + Version + "/include/c++",
           System, true, false, false);
+  AddPath(Base + "/" + Arch + "/" + Version + "/include/c++/" + Arch,
+          System, true, false, false);
   AddPath(Base + "/" + Arch + "/" + Version + "/include/c++/backward",
           System, true, false, false);
 }