diff --git a/tools/clang/lib/Frontend/InitHeaderSearch.cpp b/tools/clang/lib/Frontend/InitHeaderSearch.cpp
index cd749d2..b5591f6 100644
--- a/tools/clang/lib/Frontend/InitHeaderSearch.cpp
+++ b/tools/clang/lib/Frontend/InitHeaderSearch.cpp
@@ -393,51 +393,7 @@ void InitHeaderSearch::AddDefaultCIncludePaths(const llvm::Triple &triple) {
       AddPath(*i, System, false, false, false);
     return;
   }
-  llvm::Triple::OSType os = triple.getOS();
-  switch (os) {
-  case llvm::Triple::Win32:
-    {
-      std::string VSDir;
-      std::string WindowsSDKDir;
-      if (getVisualStudioDir(VSDir)) {
-        AddPath(VSDir + "\\VC\\include", System, false, false, false);
-        if (getWindowsSDKDir(WindowsSDKDir))
-          AddPath(WindowsSDKDir, System, false, false, false);
-        else
-          AddPath(VSDir + "\\VC\\PlatformSDK\\Include",
-            System, false, false, false);
-      }
-      else {
-          // Default install paths.
-        AddPath("C:/Program Files/Microsoft Visual Studio 9.0/VC/include",
-          System, false, false, false);
-        AddPath(
-        "C:/Program Files/Microsoft Visual Studio 9.0/VC/PlatformSDK/Include",
-          System, false, false, false);
-        AddPath("C:/Program Files/Microsoft Visual Studio 8/VC/include",
-          System, false, false, false);
-        AddPath(
-        "C:/Program Files/Microsoft Visual Studio 8/VC/PlatformSDK/Include",
-          System, false, false, false);
-          // For some clang developers.
-        AddPath("G:/Program Files/Microsoft Visual Studio 9.0/VC/include",
-          System, false, false, false);
-        AddPath(
-        "G:/Program Files/Microsoft Visual Studio 9.0/VC/PlatformSDK/Include",
-          System, false, false, false);
-      }
-    }
-    break;
-  case llvm::Triple::MinGW64:
-  case llvm::Triple::MinGW32:
-    AddPath("c:/mingw/include", System, true, false, false);
-    break;
-  default:
-    break;
-  }
-
-  AddPath("/usr/local/include", System, true, false, false);
-  AddPath("/usr/include", System, false, false, false);
+  AddPath(C_INCLUDE_PATH, System, false, false, false);
 }
 
 void InitHeaderSearch::AddDefaultCPlusPlusIncludePaths(const llvm::Triple &triple) {
@@ -453,144 +409,9 @@ void InitHeaderSearch::AddDefaultCPlusPlusIncludePaths(const llvm::Triple &tripl
                                   CXX_INCLUDE_32BIT_DIR, CXX_INCLUDE_64BIT_DIR, triple);
     return;
   }
-  // FIXME: temporary hack: hard-coded paths.
-  switch (os) {
-  case llvm::Triple::Cygwin:
-    AddPath("/lib/gcc/i686-pc-cygwin/3.4.4/include",
-        System, true, false, false);
-    AddPath("/lib/gcc/i686-pc-cygwin/3.4.4/include/c++",
-        System, true, false, false);
-    break;
-  case llvm::Triple::MinGW64:
-    // Try gcc 4.4.0
-    AddMinGWCPlusPlusIncludePaths("c:/MinGW/lib/gcc", "mingw64", "4.4.0");
-    // Try gcc 4.3.0
-    AddMinGWCPlusPlusIncludePaths("c:/MinGW/lib/gcc", "mingw64", "4.3.0");
-    // Fall through.
-  case llvm::Triple::MinGW32:
-    // Try gcc 4.4.0
-    AddMinGWCPlusPlusIncludePaths("c:/MinGW/lib/gcc", "mingw32", "4.4.0");
-    // Try gcc 4.3.0
-    AddMinGWCPlusPlusIncludePaths("c:/MinGW/lib/gcc", "mingw32", "4.3.0");
-    break;
-  case llvm::Triple::Darwin:
-    AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.2.1",
-                                "i686-apple-darwin10", "", "x86_64", triple);
-    AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.0.0",
-                                "i686-apple-darwin8", "", "", triple);
-    break;
-  case llvm::Triple::DragonFly:
-    AddPath("/usr/include/c++/4.1", System, true, false, false);
-    break;
-  case llvm::Triple::Linux:
-    // Exherbo (2010-01-25)
-    AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.4.3",
-                                "x86_64-pc-linux-gnu", "32", "", triple);
-    AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.4.3",
-                                "i686-pc-linux-gnu", "", "", triple);
-    // Debian sid
-    AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.4",
-                                "x86_64-linux-gnu", "32", "", triple);
-    AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.4",
-                                "i486-linux-gnu", "64", "", triple);
-    // Ubuntu 7.10 - Gutsy Gibbon
-    AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.1.3",
-                                "i486-linux-gnu", "", "", triple);
-    // Ubuntu 9.04
-    AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.3.3",
-                                "x86_64-linux-gnu","32", "", triple);
-    // Ubuntu 9.10
-    AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.4.1",
-                                "x86_64-linux-gnu", "32", "", triple);
-    // Fedora 8
-    AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.1.2",
-                                "i386-redhat-linux", "", "", triple);
-    // Fedora 9
-    AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.3.0",
-                                "i386-redhat-linux", "", "", triple);
-    // Fedora 10
-    AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.3.2",
-                                "i386-redhat-linux","", "", triple);
-
-    // Fedora 10 x86_64
-    AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.3.2",
-                                "x86_64-redhat-linux", "32", "", triple);
-
-    // Fedora 11
-    AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.4.1",
-                                "i586-redhat-linux","", "", triple);
-
-    // Fedora 12
-    AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.4.2",
-                                "i686-redhat-linux","", "", triple);
-
-    // Fedora 12 (February-2010+)
-    AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.4.3",
-                                "i686-redhat-linux","", "", triple);
-      
-    // openSUSE 11.1 32 bit
-    AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.3",
-                                "i586-suse-linux", "", "", triple);
-    // openSUSE 11.1 64 bit
-    AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.3",
-                                "x86_64-suse-linux", "32", "", triple);
-    // openSUSE 11.2
-    AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.4",
-                                "i586-suse-linux", "", "", triple);
-    AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.4",
-                                "x86_64-suse-linux", "", "", triple);
-    // Arch Linux 2008-06-24
-    AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.3.1",
-                                "i686-pc-linux-gnu", "", "", triple);
-    AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.3.1",
-                                "x86_64-unknown-linux-gnu", "", "", triple);
-    // Gentoo x86 2009.1 stable
-    AddGnuCPlusPlusIncludePaths(
-      "/usr/lib/gcc/i686-pc-linux-gnu/4.3.4/include/g++-v4",
-      "i686-pc-linux-gnu", "", "", triple);
-    // Gentoo x86 2009.0 stable
-    AddGnuCPlusPlusIncludePaths(
-      "/usr/lib/gcc/i686-pc-linux-gnu/4.3.2/include/g++-v4",
-      "i686-pc-linux-gnu", "", "", triple);
-    // Gentoo x86 2008.0 stable
-    AddGnuCPlusPlusIncludePaths(
-      "/usr/lib/gcc/i686-pc-linux-gnu/4.1.2/include/g++-v4",
-      "i686-pc-linux-gnu", "", "", triple);
-    // Ubuntu 8.10
-    AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.3",
-                                "i486-pc-linux-gnu", "", "", triple);
-    // Ubuntu 9.04
-    AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.3",
-                                "i486-linux-gnu","", "", triple);
-    // Gentoo amd64 stable
-    AddGnuCPlusPlusIncludePaths(
-        "/usr/lib/gcc/x86_64-pc-linux-gnu/4.1.2/include/g++-v4",
-        "i686-pc-linux-gnu", "", "", triple);
-        
-    // Gentoo amd64 gcc 4.3.2
-    AddGnuCPlusPlusIncludePaths(
-        "/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/include/g++-v4",
-        "x86_64-pc-linux-gnu", "", "", triple);
-        
-    // Gentoo amd64 gcc 4.4.3
-    AddGnuCPlusPlusIncludePaths(
-        "/usr/lib/gcc/x86_64-pc-linux-gnu/4.4.3/include/g++-v4",
-        "x86_64-pc-linux-gnu", "32", "", triple);
-    
-    break;
-  case llvm::Triple::FreeBSD:
-    AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.2", "", "", "", triple);
-    break;
-  case llvm::Triple::Solaris:
-    // Solaris - Fall though..
-  case llvm::Triple::AuroraUX:
-    // AuroraUX
-    AddGnuCPlusPlusIncludePaths("/opt/gcc4/include/c++/4.2.4",
-                                "i386-pc-solaris2.11", "", "", triple);
-    break;
-  default:
-    break;
-  }
+  AddGnuCPlusPlusIncludePaths(
+      CPP_INCLUDE_PATH,
+      CPP_HOST, "", "", triple);
 }
 
 void InitHeaderSearch::AddDefaultSystemIncludePaths(const LangOptions &Lang,