Index: llvm-toolchain-snapshot_3.5~svn201651/clang/lib/Driver/ToolChains.cpp
===================================================================
--- llvm-toolchain-snapshot_3.5~svn201651.orig/clang/lib/Driver/ToolChains.cpp	2014-02-19 09:46:43.433569829 +0100
+++ llvm-toolchain-snapshot_3.5~svn201651/clang/lib/Driver/ToolChains.cpp	2014-02-19 09:46:45.621708435 +0100
@@ -3078,6 +3078,11 @@
     return;
   }
 
+  // Force the inclusion of the gcc headers (objc/objc.h)
+  addExternCSystemIncludeIfExists(
+     DriverArgs, CC1Args, GCCInstallation.getInstallPath() + "/include");
+
+
   // Lacking those, try to detect the correct set of system includes for the
   // target triple.