diff -dur opencl-clang-8.0.1.orig/common_clang.cpp opencl-clang-8.0.1/common_clang.cpp
--- opencl-clang-8.0.1.orig/common_clang.cpp	2019-06-04 15:59:30.000000000 +0200
+++ opencl-clang-8.0.1/common_clang.cpp	2019-06-27 10:24:52.000000000 +0200
@@ -40,7 +40,7 @@
 #include "llvm/Support/TargetSelect.h"
 #include "llvm/Support/ManagedStatic.h"
 #include "llvm/Support/Mutex.h"
-#include "llvm/Support/VirtualFileSystem.h"
+#include "clang/Basic/VirtualFileSystem.h"
 #include "clang/Basic/LangOptions.h"
 #include "clang/Basic/Diagnostic.h"
 #include "clang/Basic/DiagnosticIDs.h"
@@ -215,9 +215,9 @@
 
     compiler->setDiagnostics(&*Diags);
 
-    auto OverlayFS = new llvm::vfs::OverlayFileSystem(
-        llvm::vfs::getRealFileSystem());
-    auto MemFS = new llvm::vfs::InMemoryFileSystem();
+    auto OverlayFS = new clang::vfs::OverlayFileSystem(
+        clang::vfs::getRealFileSystem());
+    auto MemFS = new clang::vfs::InMemoryFileSystem();
     OverlayFS->pushOverlay(MemFS);
 
     compiler->setVirtualFileSystem(OverlayFS);