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diff --git a/src/base/QXmppBuildConstants.h.in b/src/base/QXmppBuildConstants.h.in
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+++ b/src/base/QXmppBuildConstants.h.in
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+// SPDX-FileCopyrightText: 2010 Manjeet Dahiya <manjeetdahiya@gmail.com>
+// SPDX-FileCopyrightText: 2017 Niels Ole Salscheider <niels_ole@salscheider-online.de>
+// SPDX-FileCopyrightText: 2019 Linus Jahn <lnj@kaidan.im>
+//
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
+#ifndef QXMPPBUILDCONSTANTS_H
+#define QXMPPBUILDCONSTANTS_H
+
+#include <QString>
+
+#define QXMPP_BUILD_SHARED @QXMPP_BUILD_SHARED@
+
+#if QXMPP_BUILD_SHARED
+#    if defined(QXMPP_BUILD)
+#         define QXMPP_EXPORT Q_DECL_EXPORT
+#    else
+#         define QXMPP_EXPORT Q_DECL_IMPORT
+#    endif
+#else
+#    define QXMPP_EXPORT
+#endif
+
+#define QXMPP_AUTOTEST_EXPORT
+
+///
+/// This macro expands a numeric value of the form 0xMMNNPP (MM =
+/// major, NN = minor, PP = patch) that specifies QXmpp's version
+/// number. For example, if you compile your application against
+/// QXmpp 1.2.3, the QXMPP_VERSION macro will expand to 0x010203.
+///
+/// You can use QXMPP_VERSION to use the latest QXmpp features where
+/// available.
+///
+#define QXMPP_VERSION QT_VERSION_CHECK(@PROJECT_VERSION_MAJOR@, @PROJECT_VERSION_MINOR@, @PROJECT_VERSION_PATCH@)
+
+///
+/// Returns the version of QXmpp used at compile time as a string.
+///
+inline QLatin1String QXmppVersion()
+{
+    return QLatin1String("@PROJECT_VERSION@");
+}
+
+// This sets which deprecated functions should still be usable
+// It works exactly like QT_DISABLE_DEPRECATED_BEFORE
+#ifndef QXMPP_DISABLE_DEPRECATED_BEFORE
+#   define QXMPP_DISABLE_DEPRECATED_BEFORE 0x0
+#endif
+
+// This works exactly like QT_DEPRECATED_SINCE, but checks QXMPP_DISABLE_DEPRECATED_BEFORE instead.
+#define QXMPP_DEPRECATED_SINCE(major, minor) (QT_VERSION_CHECK(major, minor, 0) > QXMPP_DISABLE_DEPRECATED_BEFORE)
+
+// workaround for Qt < 5.12
+#ifndef Q_DECL_ENUMERATOR_DEPRECATED_X
+#define Q_DECL_ENUMERATOR_DEPRECATED_X(msg)
+#endif
+
+#ifndef QT_WARNING_DISABLE_DEPRECATED
+#define QT_WARNING_DISABLE_DEPRECATED
+#endif
+
+///
+/// \namespace QXmpp
+///
+/// Contains global functions and enumerations.
+///
+/// \since QXmpp 1.5
+///
+namespace QXmpp {
+
+///
+/// Parsing/serialization mode when using Stanza Content Encryption.
+///
+/// \sa \xep{0420, Stanza Content Encryption}
+///
+/// \since QXmpp 1.5
+///
+enum SceMode : uint8_t {
+    SceAll,        ///< Processes all known elements.
+    ScePublic,     ///< Only processes 'public' elements (e.g. needed for routing).
+    SceSensitive,  ///< Only processes sensitive elements that should be encrypted.
+};
+
+///
+/// Checks whether a mode is enabled.
+///
+/// When an SceMode is given you can use this to check whether Public or Private
+/// elements are enabled.
+///
+/// \since QXmpp 1.5
+///
+inline constexpr bool operator&(SceMode mode1, SceMode mode2)
+{
+    return mode1 == SceAll || mode1 == mode2;
+}
+
+///
+/// An empty struct indicating success in results.
+///
+/// \since QXmpp 1.5
+///
+struct Success
+{
+};
+
+}
+
+#endif  // QXMPPBUILDCONSTANTS_H