back out r149504
Too many weird build failures.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@149571 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Driver/ToolChains.cpp b/lib/Driver/ToolChains.cpp
index 0f00f0b..0c8d3dc 100644
--- a/lib/Driver/ToolChains.cpp
+++ b/lib/Driver/ToolChains.cpp
@@ -33,7 +33,11 @@
#include <cstdlib> // ::getenv
-#include "clang/Config/config.h"
+#ifdef HAVE_CLANG_CONFIG_H
+# include "clang/Config/config.h"
+#endif
+
+#include "llvm/Config/config.h" // for CXX_INCLUDE_ROOT
using namespace clang::driver;
using namespace clang::driver::toolchains;