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diff --git a/vcl/inc/unx/screensaverinhibitor.hxx b/vcl/inc/unx/screensaverinhibitor.hxx
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+++ b/vcl/inc/unx/screensaverinhibitor.hxx
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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/.
+ */
+
+#ifndef INCLUDED_VCL_INC_UNX_SCREENSAVERINHIBITOR_HXX
+#define INCLUDED_VCL_INC_UNX_SCREENSAVERINHIBITOR_HXX
+
+#include <X11/Xlib.h>
+#include <X11/Xmd.h>
+
+#include <rtl/ustring.hxx>
+#include <vcl/dllapi.h>
+
+#include <optional>
+
+class VCL_PLUGIN_PUBLIC ScreenSaverInhibitor
+{
+public:
+    void inhibit( bool bInhibit, const OUString& sReason,
+                  bool bIsX11, const std::optional<unsigned int>& xid, std::optional<Display*> pDisplay );
+
+private:
+    // These are all used as guint, however this header may be included
+    // in kde/tde/etc backends, where we would ideally avoid having
+    // any glib dependencies, hence the direct use of unsigned int.
+    std::optional<unsigned int> mnFDOCookie; // FDO ScreenSaver Inhibit
+    std::optional<unsigned int> mnFDOPMCookie; // FDO PowerManagement Inhibit
+    std::optional<unsigned int> mnGSMCookie;
+    std::optional<unsigned int> mnMSMCookie;
+
+    std::optional<int> mnXScreenSaverTimeout;
+
+#if !defined(__sun) && !defined(AIX)
+    BOOL mbDPMSWasEnabled;
+    CARD16 mnDPMSStandbyTimeout;
+    CARD16 mnDPMSSuspendTimeout;
+    CARD16 mnDPMSOffTimeout;
+#endif
+
+    // There are a bunch of different dbus based inhibition APIs. Some call
+    // themselves ScreenSaver inhibition, some are PowerManagement inhibition,
+    // but they appear to have the same effect. There doesn't appear to be one
+    // all encompassing standard, hence we should just try all of them.
+    //
+    // The current APIs we have: (note: the list of supported environments is incomplete)
+    // FDO: org.freedesktop.ScreenSaver::Inhibit - appears to be supported only by KDE?
+    // FDOPM: org.freedesktop.PowerManagement.Inhibit::Inhibit - XFCE, (KDE) ?
+    //        (KDE: doesn't inhibit screensaver, but does inhibit PowerManagement)
+    // GSM: org.gnome.SessionManager::Inhibit - gnome 3
+    // MSM: org.mate.Sessionmanager::Inhibit - Mate <= 1.10, is identical to GSM
+    //       (This is replaced by the GSM interface from Mate 1.12 onwards)
+    //
+    // Note: the Uninhibit call has different spelling in FDO (UnInhibit) vs GSM (Uninhibit)
+    void inhibitFDO( bool bInhibit, const char* appname, const char* reason );
+    void inhibitFDOPM( bool bInhibit, const char* appname, const char* reason );
+    void inhibitGSM( bool bInhibit, const char* appname, const char* reason, const unsigned int xid );
+    void inhibitMSM( bool bInhibit, const char* appname, const char* reason, const unsigned int xid );
+
+    void inhibitXScreenSaver( bool bInhibit, Display* pDisplay );
+    static void inhibitXAutoLock( bool bInhibit, Display* pDisplay );
+    void inhibitDPMS( bool bInhibit, Display* pDisplay );
+};
+
+#endif // INCLUDED_VCL_INC_UNX_SCREENSAVERINHIBITOR_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */