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diff --git a/include/osl/diagnose.h b/include/osl/diagnose.h
new file mode 100644
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+++ b/include/osl/diagnose.h
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you 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 .
+ */
+
+/*
+ * This file is part of LibreOffice published API.
+ */
+
+#ifndef INCLUDED_OSL_DIAGNOSE_H
+#define INCLUDED_OSL_DIAGNOSE_H
+
+#include "sal/config.h"
+
+#include "sal/detail/log.h"
+#include "sal/types.h"
+
+/** @file
+    Provides simple diagnostic support.
+
+    @deprecated
+    The facilities provided by this header are deprecated.  True assertions
+    (that detect broken program logic) should use standard assert (which aborts
+    if an assertion fails, and is controlled by the standard NDEBUG macro).
+    Logging of warnings (e.g., about malformed input) and traces (e.g., about
+    steps taken while executing some protocol) should use the facilities
+    provided by (C++ only) sal/log.hxx.
+
+    Because the assertion macros (OSL_ASSERT, OSL_ENSURE, OSL_FAIL, OSL_PRECOND,
+    and OSL_POSTCOND) have been used for true assertions as well as for logged
+    warnings, they map to SAL_WARN instead of standard assert.  OSL_TRACE maps
+    to SAL_INFO.
+
+    The functions defined in this header are not intended to be used directly,
+    but through defined macros. The macros can be divided into three categories:
+    assertions, traces and other stuff .-) Their usability depends on the value
+    of OSL_DEBUG_LEVEL macro: assertions are only active if OSL_DEBUG_LEVEL is 1
+    or greater, traces if OSL_DEBUG_LEVEL is 2 or greater.
+
+    Traces:
+    OSL_TRACE(fmt, args...)
+        Prints trace message. The arguments have the same meaning as the
+        arguments of printf.
+ */
+
+#if !defined OSL_DEBUG_LEVEL
+#define OSL_DEBUG_LEVEL 0
+#endif
+
+/** @internal The macro OSL_LOG_PREFIX is intended to be an office internal macro for now
+    @deprecated superseded by (C++ only) SAL_WHERE
+*/
+#define OSL_LOG_PREFIX SAL_DETAIL_WHERE
+
+/** Prints trace message.
+
+    The arguments have the same meaning as the arguments of printf.
+*/
+#define OSL_TRACE(...) \
+    SAL_DETAIL_INFO_IF_FORMAT(OSL_DEBUG_LEVEL > 0, "legacy.osl", __VA_ARGS__)
+
+/** @defgroup assert Assertions
+
+    Assertions (cond is bool, msg is char*).
+
+    @{
+ */
+
+/** If cond is false, reports an error. */
+#define OSL_ASSERT(c) \
+    SAL_DETAIL_WARN_IF_FORMAT(!(c), "legacy.osl", "OSL_ASSERT: %s", #c)
+/** If cond is false, reports an error with message msg. */
+#define OSL_ENSURE(c, m) SAL_DETAIL_WARN_IF_FORMAT(!(c), "legacy.osl", "%s", m)
+/** Reports an error with message msg unconditionally. */
+#define OSL_FAIL(m) SAL_DETAIL_WARN_IF_FORMAT(sal_True, "legacy.osl", "%s", m)
+
+/** Evaluates the expression and if it is false, reports an error. The
+    expression is evaluated once without regard of the value of
+    OSL_DEBUG_LEVEL.
+
+    Example:
+
+    @code{.c}
+
+    void extractBool(Any const& rAny, bool& rBool)
+    {
+        OSL_VERIFY(rAny >>= rBool);
+    }
+
+    @endcode
+*/
+#define OSL_VERIFY(c) do { if (!(c)) OSL_ASSERT(0); } while (0)
+
+/** Check the precondition of functions.
+
+    Functionally equivalent to OSL_ENSURE(cond, msg).
+*/
+#define OSL_PRECOND(c, m)   OSL_ENSURE(c, m)
+
+/** Check the postcondition of functions.
+
+    Functionally equivalent to OSL_ENSURE(cond, msg).
+*/
+#define OSL_POSTCOND(c, m)  OSL_ENSURE(c, m)
+
+/** @} */
+
+#endif // INCLUDED_OSL_DIAGNOSE_H
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */