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diff --git a/src/debug/static_assert.h b/src/debug/static_assert.h
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+// -*- Mode: C++; tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*-
+// vim:tabstop=4:shiftwidth=4:expandtab:
+
+/*
+ * Copyright (C) 2004-2008 Wu Yongwei <adah at users dot sourceforge dot net>
+ *
+ * This software is provided 'as-is', without any express or implied
+ * warranty.  In no event will the authors be held liable for any
+ * damages arising from the use of this software.
+ *
+ * Permission is granted to anyone to use this software for any purpose,
+ * including commercial applications, and to alter it and redistribute
+ * it freely, subject to the following restrictions:
+ *
+ * 1. The origin of this software must not be misrepresented; you must
+ *    not claim that you wrote the original software.  If you use this
+ *    software in a product, an acknowledgement in the product
+ *    documentation would be appreciated but is not required.
+ * 2. Altered source versions must be plainly marked as such, and must
+ *    not be misrepresented as being the original software.
+ * 3. This notice may not be removed or altered from any source
+ *    distribution.
+ *
+ * This file is part of Stones of Nvwa:
+ *      http://sourceforge.net/projects/nvwa
+ *
+ * original version changed for ManaPlus
+ *
+ * Copyright (C) 2011 ManaPlus developers
+ */
+
+/**
+ * @file    static_assert.h
+ *
+ * Template class to check validity duing compile time (adapted from Loki).
+ *
+ * @version 1.2, 2005/11/22
+ * @author  Wu Yongwei
+ *
+ */
+
+#ifndef STATIC_ASSERT
+
+template <bool> struct __nvwa_compile_time_error;
+template <>     struct __nvwa_compile_time_error<true> {};
+
+#define STATIC_ASSERT(_Expr, _Msg) \
+    { \
+        __nvwa_compile_time_error<((_Expr) != 0)> ERROR_##_Msg; \
+        (void)ERROR_##_Msg; \
+    }
+
+#endif // STATIC_ASSERT