-// IMPORTANT: Do not include this file directly. Include Type.h instead.
-// Some versions of GCC can't handle the inlined method PATypeHolder::dropRef()
-// correctly otherwise.
+#if !defined(LLVM_TYPE_H) && !defined(LLVM_VALUE_H)
+#error Do not include this file directly. Include Type.h instead.
+#error Some versions of GCC (e.g. 3.4 and 4.1) can not handle the inlined method
+#error PATypeHolder::dropRef() correctly otherwise.
+#endif