diff --git a/tools/versioner/src/Driver.h b/tools/versioner/src/Driver.h
new file mode 100644
index 0000000..c1a4b24
--- /dev/null
+++ b/tools/versioner/src/Driver.h
@@ -0,0 +1,35 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <set>
+#include <string>
+#include <unordered_map>
+
+#include "Arch.h"
+#include "DeclarationDatabase.h"
+
+struct CompilationRequirements {
+  std::vector<std::string> headers;
+  std::vector<std::string> dependencies;
+};
+
+void initializeTargetCC1FlagCache(const std::set<CompilationType>& types,
+                                  const std::unordered_map<Arch, CompilationRequirements>& reqs);
+
+void compileHeader(HeaderDatabase* header_database, CompilationType type,
+                   const std::string& filename);