diff --git a/tools/versioner/src/versioner.h b/tools/versioner/src/versioner.h
new file mode 100644
index 0000000..95635bb
--- /dev/null
+++ b/tools/versioner/src/versioner.h
@@ -0,0 +1,57 @@
+/*
+ * Copyright 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 <map>
+#include <set>
+#include <string>
+#include <unordered_map>
+
+extern bool verbose;
+
+static const std::set<std::string> supported_archs = {
+  "arm", "arm64", "mips", "mips64", "x86", "x86_64",
+};
+
+static std::unordered_map<std::string, std::string> arch_targets = {
+  { "arm", "arm-linux-androideabi" },
+  { "arm64", "aarch64-linux-android" },
+  { "mips", "mipsel-linux-android" },
+  { "mips64", "mips64el-linux-android" },
+  { "x86", "i686-linux-android" },
+  { "x86_64", "x86_64-linux-android" },
+};
+
+static const std::set<int> supported_levels = { 9, 12, 13, 14, 15, 16, 17, 18, 19, 21, 23, 24 };
+
+// Non-const for the convenience of being able to index with operator[].
+static std::map<std::string, int> arch_min_api = {
+  { "arm", 9 },
+  { "arm64", 21 },
+  { "mips", 9 },
+  { "mips64", 21 },
+  { "x86", 9 },
+  { "x86_64", 21 },
+};
+
+static const std::unordered_map<std::string, std::set<std::string>> header_blacklist = {
+  // Internal header.
+  { "sys/_system_properties.h", supported_archs },
+
+  // time64.h #errors when included on LP64 archs.
+  { "time64.h", { "arm64", "mips64", "x86_64" } },
+};