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diff --git a/src/version.h b/src/version.h
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+// Copyright 2013 Google Inc. All Rights Reserved.
+//
+// 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.
+
+#ifndef NINJA_VERSION_H_
+#define NINJA_VERSION_H_
+
+#include <string>
+using namespace std;
+
+/// The version number of the current Ninja release.  This will always
+/// be "git" on trunk.
+extern const char* kNinjaVersion;
+
+/// Parse the major/minor components of a version string.
+void ParseVersion(const string& version, int* major, int* minor);
+
+/// Check whether \a version is compatible with the current Ninja version,
+/// aborting if not.
+void CheckNinjaVersion(const string& required_version);
+
+#endif  // NINJA_VERSION_H_