diff --git a/src/glog/platform.h b/src/glog/platform.h
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+++ b/src/glog/platform.h
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+// Copyright (c) 2008, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+// Author: Shinichiro Hamaji
+//
+// Detect supported platforms.
+
+#ifndef GLOG_PLATFORM_H
+#define GLOG_PLATFORM_H
+
+#if defined(WIN32) || defined(_WIN32) || defined(__WIN32__)
+#define GLOG_OS_WINDOWS
+#elif defined(__CYGWIN__) || defined(__CYGWIN32__)
+#define GLOG_OS_CYGWIN
+#elif defined(linux) || defined(__linux) || defined(__linux__)
+#ifndef GLOG_OS_LINUX
+#define GLOG_OS_LINUX
+#endif
+#elif defined(macintosh) || defined(__APPLE__) || defined(__APPLE_CC__)
+#define GLOG_OS_MACOSX
+#elif defined(__FreeBSD__)
+#define GLOG_OS_FREEBSD
+#elif defined(__NetBSD__)
+#define GLOG_OS_NETBSD
+#elif defined(__OpenBSD__)
+#define GLOG_OS_OPENBSD
+#elif defined(__EMSCRIPTEN__)
+#define GLOG_OS_EMSCRIPTEN
+#else
+// TODO(hamaji): Add other platforms.
+#error Platform not supported by glog. Please consider to contribute platform information by submitting a pull request on Github.
+#endif
+
+#endif // GLOG_PLATFORM_H