diff --git a/lib/Frontend/InitHeaderSearch.cpp b/lib/Frontend/InitHeaderSearch.cpp
index f9ccb8a..0e120e8 100644
--- a/lib/Frontend/InitHeaderSearch.cpp
+++ b/lib/Frontend/InitHeaderSearch.cpp
@@ -11,13 +11,14 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "clang/Frontend/InitHeaderSearch.h"
+#include "clang/Frontend/Utils.h"
 #include "clang/Basic/FileManager.h"
 #include "clang/Basic/LangOptions.h"
 #include "clang/Frontend/HeaderSearchOptions.h"
 #include "clang/Lex/HeaderSearch.h"
 #include "llvm/ADT/SmallString.h"
 #include "llvm/ADT/SmallPtrSet.h"
+#include "llvm/ADT/Triple.h"
 #include "llvm/Support/raw_ostream.h"
 #include "llvm/System/Path.h"
 #include "llvm/Config/config.h"
@@ -27,6 +28,64 @@
   #include <windows.h>
 #endif
 using namespace clang;
+using namespace clang::frontend;
+
+namespace {
+
+/// InitHeaderSearch - This class makes it easier to set the search paths of
+///  a HeaderSearch object. InitHeaderSearch stores several search path lists
+///  internally, which can be sent to a HeaderSearch object in one swoop.
+class InitHeaderSearch {
+  std::vector<DirectoryLookup> IncludeGroup[4];
+  HeaderSearch& Headers;
+  bool Verbose;
+  std::string isysroot;
+
+public:
+
+  InitHeaderSearch(HeaderSearch &HS,
+      bool verbose = false, const std::string &iSysroot = "")
+    : Headers(HS), Verbose(verbose), isysroot(iSysroot) {}
+
+  /// AddPath - Add the specified path to the specified group list.
+  void AddPath(const llvm::StringRef &Path, IncludeDirGroup Group,
+               bool isCXXAware, bool isUserSupplied,
+               bool isFramework, bool IgnoreSysRoot = false);
+
+  /// AddGnuCPlusPlusIncludePaths - Add the necessary paths to suport a gnu
+  ///  libstdc++.
+  void AddGnuCPlusPlusIncludePaths(const std::string &Base, const char *Dir32,
+                                   const char *Dir64,
+                                   const llvm::Triple &triple);
+
+  /// AddMinGWCPlusPlusIncludePaths - Add the necessary paths to suport a MinGW
+  ///  libstdc++.
+  void AddMinGWCPlusPlusIncludePaths(const std::string &Base,
+                                     const char *Arch,
+                                     const char *Version);
+
+  /// AddDelimitedPaths - Add a list of paths delimited by the system PATH
+  /// separator. The processing follows that of the CPATH variable for gcc.
+  void AddDelimitedPaths(const char *String);
+
+  // AddDefaultCIncludePaths - Add paths that should always be searched.
+  void AddDefaultCIncludePaths(const llvm::Triple &triple);
+
+  // AddDefaultCPlusPlusIncludePaths -  Add paths that should be searched when
+  //  compiling c++.
+  void AddDefaultCPlusPlusIncludePaths(const llvm::Triple &triple);
+
+  /// AddDefaultSystemIncludePaths - Adds the default system include paths so
+  ///  that e.g. stdio.h is found.
+  void AddDefaultSystemIncludePaths(const LangOptions &Lang,
+                                    const llvm::Triple &triple);
+
+  /// Realize - Merges all search path lists into one list and send it to
+  /// HeaderSearch.
+  void Realize();
+};
+
+}
 
 void InitHeaderSearch::AddPath(const llvm::StringRef &Path,
                                IncludeDirGroup Group, bool isCXXAware,
@@ -601,7 +660,7 @@
   if (!HSOpts.BuiltinIncludePath.empty()) {
     // Ignore the sys root, we *always* look for clang headers relative to
     // supplied path.
-    Init.AddPath(HSOpts.BuiltinIncludePath, InitHeaderSearch::System,
+    Init.AddPath(HSOpts.BuiltinIncludePath, System,
                  false, false, false, /*IgnoreSysRoot=*/ true);
   }