diff --git a/AUTHORS b/AUTHORS
index fbb968f..5fec64d 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -4,7 +4,7 @@ Upstream Authors:
 
 Copyright:
     Copyright (c) 2010-2012 Razor team
-    Copyright (c) 2012-2016 LXQt team
+    Copyright (c) 2012-2017 LXQt team
 
 License: LGPL-2.1+ and BSD-3-clause
 The full text of the LGPL-2.1+ licenses can be found in the 'COPYING' file.
diff --git a/CHANGELOG b/CHANGELOG
index c825c8a..a2e87a6 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,7 +1,30 @@
 
-liblxqt-0.11.1 / 2017-01-01
+liblxqt-0.12.0 / 2017-10-21
 ===========================
 
+  * Bump minimum qtxdg version to 3.1.0
+  * Don't export github templates
+  * Bump version and needed versions to the final values
+  * lxqtpower: Allow disabling of lxqt-session provider
+  * Drops Qt5Core_VERSION_STRING
+  * HtmlDelegate: Fix sizeHint() computation
+  * Add some comments about the meaning of versions
+  * Move LXQt version back to liblxqt
+  * Fixes (#118)
+  * lxqtapplication: Avoid wrong signal handling
+  * Removes unneeded semicolon in namespace definition
+  * Fix format conversions [-Wformat-pedantic] warnings
+  * Suppress compiler warnings about unused function parameters
+  * Removes extra semicolons in Qt's Q macros
+  * Translator: Prefer XDG_DATA_DIRS over compiled in path
+  * Help the compiler optimizing loops
+  * Use const variables where possible
+  * Update AUTHORS
+
+0.11.1 / 2017-01-01
+===================
+
+  * Release 0.11.1: Update changelog
   * Bump needed build tools version (#113)
   * build: Enable/disable WITH_XDG_DIRS_FALLBACK based on Qt version (#111)
   * Updates lxqt-build-tools required version
diff --git a/CMakeLists.txt b/CMakeLists.txt
index d421319..44eddc8 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -2,9 +2,25 @@ cmake_minimum_required(VERSION 3.0.2 FATAL_ERROR)
 
 project(liblxqt)
 
-set(QT_MINIMUM_VERSION "5.4.2")
-set(QTXDG_MINIMUM_VERSION "2.0.0")
-set(LXQTBT_MINIMUM_VERSION "0.3.1")
+set(QT_MINIMUM_VERSION "5.5.0")
+set(QTXDG_MINIMUM_VERSION "3.1.0")
+set(LXQTBT_MINIMUM_VERSION "0.4.0")
+
+# Major LXQt Version, belong to all components
+set(LXQT_MAJOR_VERSION 0)
+# Minor LXQt Version, belong to all components
+set(LXQT_MINOR_VERSION 12)
+#
+# Patch Version, belong *only* to the component
+# LXQt is 0.11 - liblxqt is at patch version 1
+# The official LXQt version will follow liblxqt.
+#
+# In a perfect world all components would have the same major- and minor- and
+# patch-version as liblxqt - in real life it will be fine if every component
+# has it's own patch version within a major/minor life cyle.
+#
+set(LXQT_PATCH_VERSION 0)
+set(LXQT_VERSION ${LXQT_MAJOR_VERSION}.${LXQT_MINOR_VERSION}.${LXQT_PATCH_VERSION})
 
 include(CMakePackageConfigHelpers)
 include(GNUInstallDirs) # Standard directories for installation
@@ -118,7 +134,7 @@ find_package(X11 REQUIRED QUIET)
 find_package(Qt5 ${QT_MINIMUM_VERSION} CONFIG REQUIRED Widgets DBus X11Extras LinguistTools)
 find_package(Qt5Xdg ${QTXDG_MINIMUM_VERSION} REQUIRED)
 find_package(KF5WindowSystem REQUIRED QUIET)
-message(STATUS "Building ${PROJECT_NAME} with Qt ${Qt5Core_VERSION_STRING}")
+message(STATUS "Building ${PROJECT_NAME} with Qt ${Qt5Core_VERSION}")
 
 QT5_ADD_DBUS_INTERFACE(SRCS
     dbus/org.freedesktop.Notifications.xml
diff --git a/cmake/lxqt-config.cmake.in b/cmake/lxqt-config.cmake.in
index 227d789..5cb6dc5 100644
--- a/cmake/lxqt-config.cmake.in
+++ b/cmake/lxqt-config.cmake.in
@@ -17,6 +17,18 @@ find_dependency(KF5WindowSystem)
 find_dependency(lxqt-build-tools @LXQTBT_MINIMUM_VERSION@)
 include(LXQtConfigVars)
 
+
+#  - Set version informations
+set(LXQT_MAJOR_VERSION      "@LXQT_MAJOR_VERSION@")
+set(LXQT_MINOR_VERSION      "@LXQT_MINOR_VERSION@")
+set(LXQT_PATCH_VERSION      "@LXQT_PATCH_VERSION@")
+set(LXQT_VERSION            "@LXQT_VERSION@")
+
+add_definitions("-DLXQT_MAJOR_VERSION=\"${LXQT_MAJOR_VERSION}\"")
+add_definitions("-DLXQT_MINOR_VERSION=\"${LXQT_MINOR_VERSION}\"")
+add_definitions("-DLXQT_PATCH_VERSION=\"${LXQT_PATCH_VERSION}\"")
+add_definitions("-DLXQT_VERSION=\"${LXQT_VERSION}\"")
+
 if (NOT TARGET @LXQT_LIBRARY_NAME@)
     if (POLICY CMP0024)
         cmake_policy(SET CMP0024 NEW)
diff --git a/configdialog/lxqtconfigdialog.cpp b/configdialog/lxqtconfigdialog.cpp
index 8eea57b..947a578 100644
--- a/configdialog/lxqtconfigdialog.cpp
+++ b/configdialog/lxqtconfigdialog.cpp
@@ -112,6 +112,7 @@ bool ConfigDialog::event(QEvent * event)
 
 void ConfigDialog::closeEvent(QCloseEvent* event)
 {
+    Q_UNUSED(event)
     emit save();
     mSettings->sync();
 }
diff --git a/debian/changelog b/debian/changelog
index a52feee..b761afd 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,14 @@
+liblxqt (0.12.0-1) experimental; urgency=medium
+
+  * Cherry-picking upstream version 0.12.0.
+  * Switched to experimental
+  * Bumped Standards to 4.1.1
+  * Bumped dependencies
+  * Fixed symbols
+  * Added override for dh_missing in rules  
+
+ -- Alf Gaida <agaida@siduction.org>  Sun, 22 Oct 2017 14:28:46 +0200
+
 liblxqt (0.11.1-2) unstable; urgency=medium
 
   * Bumped Standards to 4.0.0
diff --git a/debian/control b/debian/control
index 2783a70..df78005 100644
--- a/debian/control
+++ b/debian/control
@@ -11,10 +11,10 @@ Build-Depends: debhelper (>= 10),
                libqt5x11extras5-dev,
                libx11-dev,
                libxss-dev,
-               lxqt-build-tools (>= 0.3.1)
-Standards-Version: 4.0.0
-Vcs-Browser: https://anonscm.debian.org/cgit/pkg-lxqt/liblxqt.git/?h=debian/sid
-Vcs-Git: https://anonscm.debian.org/git/pkg-lxqt/liblxqt.git -b debian/sid
+               lxqt-build-tools (>= 0.4.0)
+Standards-Version: 4.1.1
+Vcs-Browser: https://anonscm.debian.org/cgit/pkg-lxqt/liblxqt.git/?h=debian/experimental
+Vcs-Git: https://anonscm.debian.org/git/pkg-lxqt/liblxqt.git -b debian/experimental
 Homepage: https://github.com/lxde/liblxqt
 
 Package: liblxqt0
@@ -40,8 +40,8 @@ Architecture: any
 Section: libdevel
 Depends: ${misc:Depends},
          liblxqt0 (= ${binary:Version}),
-         libqt5xdg-dev (>= 2.0.0),
-         libqt5xdgiconloader-dev (>= 2.0.0),
+         libqt5xdg-dev (>= 3.1.0),
+         libqt5xdgiconloader-dev (>= 3.1.0),
          lxqt-build-tools
 Description: Shared libraries for LXQt desktop environment (dev)
  LXQt is an advanced, easy-to-use, and fast desktop environment based on Qt
diff --git a/debian/liblxqt0.symbols b/debian/liblxqt0.symbols
index 2bc73b6..4212047 100644
--- a/debian/liblxqt0.symbols
+++ b/debian/liblxqt0.symbols
@@ -1,6 +1,6 @@
 liblxqt.so.0 liblxqt0 #MINVER#
- (c++)"LXQt::Application::Application(int&, char**)@Base" 0.9.0+20150911
  (c++)"LXQt::Application::Application(int&, char**, bool)@Base" 0.9.0+20150911
+ (c++)"LXQt::Application::Application(int&, char**)@Base" 0.9.0+20150911
  (c++)"LXQt::Application::listenToUnixSignals(QList<int> const&)@Base" 0.9.0+20150911
  (c++)"LXQt::Application::metaObject() const@Base" 0.9.0+20150911
  (c++)"LXQt::Application::qt_metacall(QMetaObject::Call, int, void**)@Base" 0.9.0+20150911
@@ -18,12 +18,12 @@ liblxqt.so.0 liblxqt0 #MINVER#
  (c++)"LXQt::AutostartEntry::removeLocal()@Base" 0.9.0+20150911
  (c++)"LXQt::AutostartEntry::setEnabled(bool)@Base" 0.9.0+20150911
  (c++)"LXQt::AutostartEntry::setFile(XdgDesktopFile const&)@Base" 0.9.0+20150911
+ (c++)"LXQt::ConfigDialog::~ConfigDialog()@Base" 0.9.0+20150911
+ (c++)"LXQt::ConfigDialog::ConfigDialog(QString const&, LXQt::Settings*, QWidget*)@Base" 0.9.0+20150911
  (c++)"LXQt::ConfigDialog::addPage(QWidget*, QString const&, QString const&)@Base" 0.9.0+20150911
  (c++)"LXQt::ConfigDialog::addPage(QWidget*, QString const&, QStringList const&)@Base" 0.9.0+20150911
  (c++)"LXQt::ConfigDialog::clicked(QDialogButtonBox::StandardButton)@Base" 0.9.0+20150911
  (c++)"LXQt::ConfigDialog::closeEvent(QCloseEvent*)@Base" 0.9.0+20150911
- (c++)"LXQt::ConfigDialog::~ConfigDialog()@Base" 0.9.0+20150911
- (c++)"LXQt::ConfigDialog::ConfigDialog(QString const&, LXQt::Settings*, QWidget*)@Base" 0.9.0+20150911
  (c++)"LXQt::ConfigDialog::dialogButtonsAction(QAbstractButton*)@Base" 0.9.0+20150911
  (c++)"LXQt::ConfigDialog::event(QEvent*)@Base" 0.11.0
  (c++)"LXQt::ConfigDialog::metaObject() const@Base" 0.9.0+20150911
@@ -35,6 +35,8 @@ liblxqt.so.0 liblxqt0 #MINVER#
  (c++)"LXQt::ConfigDialog::showPage(QWidget*)@Base" 0.9.0+20150911
  (c++)"LXQt::ConfigDialog::staticMetaObject@Base" 0.9.0+20150911
  (c++)"LXQt::ConfigDialog::updateIcons()@Base" 0.9.0+20150911
+ (c++)"LXQt::GridLayout::~GridLayout()@Base" 0.9.0+20150911
+ (c++)"LXQt::GridLayout::GridLayout(QWidget*)@Base" 0.9.0+20150911
  (c++)"LXQt::GridLayout::addItem(QLayoutItem*)@Base" 0.9.0+20150911
  (c++)"LXQt::GridLayout::animatedMoveInProgress() const@Base" 0.11.0
  (c++)"LXQt::GridLayout::cellMaximumSize() const@Base" 0.9.0+20150911
@@ -42,8 +44,6 @@ liblxqt.so.0 liblxqt0 #MINVER#
  (c++)"LXQt::GridLayout::columnCount() const@Base" 0.9.0+20150911
  (c++)"LXQt::GridLayout::count() const@Base" 0.9.0+20150911
  (c++)"LXQt::GridLayout::direction() const@Base" 0.9.0+20150911
- (c++)"LXQt::GridLayout::~GridLayout()@Base" 0.9.0+20150911
- (c++)"LXQt::GridLayout::GridLayout(QWidget*)@Base" 0.9.0+20150911
  (c++)"LXQt::GridLayout::invalidate()@Base" 0.9.0+20150911
  (c++)"LXQt::GridLayout::itemAt(int) const@Base" 0.9.0+20150911
  (c++)"LXQt::GridLayout::metaObject() const@Base" 0.9.0+20150911
@@ -78,28 +78,28 @@ liblxqt.so.0 liblxqt0 #MINVER#
  (c++)"LXQt::HtmlDelegate::qt_metacast(char const*)@Base" 0.9.0+20150911
  (c++)"LXQt::HtmlDelegate::sizeHint(QStyleOptionViewItem const&, QModelIndex const&) const@Base" 0.9.0+20150911
  (c++)"LXQt::HtmlDelegate::staticMetaObject@Base" 0.9.0+20150911
+ (c++)"LXQt::LXQtTheme::~LXQtTheme()@Base" 0.12.0
+ (c++)"LXQt::LXQtTheme::LXQtTheme()@Base" 0.9.0+20150911
+ (c++)"LXQt::LXQtTheme::LXQtTheme(LXQt::LXQtTheme const&)@Base" 0.9.0+20150911
+ (c++)"LXQt::LXQtTheme::LXQtTheme(QString const&)@Base" 0.9.0+20150911
  (c++)"LXQt::LXQtTheme::allThemes()@Base" 0.9.0+20150911
  (c++)"LXQt::LXQtTheme::currentTheme()@Base" 0.9.0+20150911
  (c++)"LXQt::LXQtTheme::desktopBackground(int) const@Base" 0.9.0+20150911
  (c++)"LXQt::LXQtTheme::isValid() const@Base" 0.9.0+20150911
- (c++)"LXQt::LXQtTheme::~LXQtTheme()@Base" 0.9.0+20150911
- (c++)"LXQt::LXQtTheme::LXQtTheme()@Base" 0.9.0+20150911
- (c++)"LXQt::LXQtTheme::LXQtTheme(LXQt::LXQtTheme const&)@Base" 0.9.0+20150911
- (c++)"LXQt::LXQtTheme::LXQtTheme(QString const&)@Base" 0.9.0+20150911
  (c++)"LXQt::LXQtTheme::mInstance@Base" 0.9.0+20150911
  (c++)"LXQt::LXQtTheme::name() const@Base" 0.9.0+20150911
  (c++)"LXQt::LXQtTheme::operator=(LXQt::LXQtTheme const&)@Base" 0.9.0+20150911
  (c++)"LXQt::LXQtTheme::path() const@Base" 0.9.0+20150911
  (c++)"LXQt::LXQtTheme::previewImage() const@Base" 0.9.0+20150911
  (c++)"LXQt::LXQtTheme::qss(QString const&) const@Base" 0.9.0+20150911
+ (c++)"LXQt::Notification::~Notification()@Base" 0.9.0+20150911
+ (c++)"LXQt::Notification::Notification(QString const&, QObject*)@Base" 0.9.0+20150911
  (c++)"LXQt::Notification::actionActivated(int)@Base" 0.9.0+20150911
  (c++)"LXQt::Notification::clearHints()@Base" 0.9.0+20150911
  (c++)"LXQt::Notification::close()@Base" 0.9.0+20150911
  (c++)"LXQt::Notification::getCapabilities()@Base" 0.9.0+20150911
  (c++)"LXQt::Notification::metaObject() const@Base" 0.9.0+20150911
- (c++)"LXQt::Notification::~Notification()@Base" 0.9.0+20150911
  (c++)"LXQt::Notification::notificationClosed(LXQt::Notification::CloseReason)@Base" 0.9.0+20150911
- (c++)"LXQt::Notification::Notification(QString const&, QObject*)@Base" 0.9.0+20150911
  (c++)"LXQt::Notification::notify(QString const&, QString const&, QString const&)@Base" 0.9.0+20150911
  (c++)"LXQt::Notification::qt_metacall(QMetaObject::Call, int, void**)@Base" 0.9.0+20150911
  (c++)"LXQt::Notification::qt_metacast(char const*)@Base" 0.9.0+20150911
@@ -113,39 +113,30 @@ liblxqt.so.0 liblxqt0 #MINVER#
  (c++)"LXQt::Notification::setUrgencyHint(LXQt::Notification::Urgency)@Base" 0.9.0+20150911
  (c++)"LXQt::Notification::staticMetaObject@Base" 0.9.0+20150911
  (c++)"LXQt::Notification::update()@Base" 0.9.0+20150911
+ (c++)"LXQt::PageSelectWidget::~PageSelectWidget()@Base" 0.9.0+20150911
+ (c++)"LXQt::PageSelectWidget::PageSelectWidget(QWidget*)@Base" 0.9.0+20150911
  (c++)"LXQt::PageSelectWidget::event(QEvent*)@Base" 0.11.0
  (c++)"LXQt::PageSelectWidget::maxTextWidth() const@Base" 0.11.0
  (c++)"LXQt::PageSelectWidget::metaObject() const@Base" 0.9.0+20150911
  (c++)"LXQt::PageSelectWidget::minimumSizeHint() const@Base" 0.11.0
- (c++)"LXQt::PageSelectWidget::~PageSelectWidget()@Base" 0.9.0+20150911
- (c++)"LXQt::PageSelectWidget::PageSelectWidget(QWidget*)@Base" 0.9.0+20150911
  (c++)"LXQt::PageSelectWidget::qt_metacall(QMetaObject::Call, int, void**)@Base" 0.9.0+20150911
  (c++)"LXQt::PageSelectWidget::qt_metacast(char const*)@Base" 0.9.0+20150911
  (c++)"LXQt::PageSelectWidget::staticMetaObject@Base" 0.9.0+20150911
  (c++)"LXQt::PageSelectWidget::updateMaxTextWidth()@Base" 0.11.0
  (c++)"LXQt::PageSelectWidget::viewportSizeHint() const@Base" 0.11.0
+ (c++)"LXQt::PluginInfo::PluginInfo()@Base" 0.9.0+20150911
  (c++)"LXQt::PluginInfo::isValid() const@Base" 0.9.0+20150911
  (c++)"LXQt::PluginInfo::loadLibrary(QString const&) const@Base" 0.9.0+20150911
  (c++)"LXQt::PluginInfo::load(QString const&)@Base" 0.9.0+20150911
- (c++)"LXQt::PluginInfo::PluginInfo()@Base" 0.9.0+20150911
  (c++)"LXQt::PluginInfo::search(QString const&, QString const&, QString const&)@Base" 0.9.0+20150911
  (c++)"LXQt::PluginInfo::search(QStringList const&, QString const&, QString const&)@Base" 0.9.0+20150911
- (c++)"LXQt::Power::canAction(LXQt::Power::Action) const@Base" 0.9.0+20150911
- (c++)"LXQt::Power::canHibernate() const@Base" 0.9.0+20150911
- (c++)"LXQt::Power::canLogout() const@Base" 0.9.0+20150911
- (c++)"LXQt::Power::canReboot() const@Base" 0.9.0+20150911
- (c++)"LXQt::Power::canShutdown() const@Base" 0.9.0+20150911
- (c++)"LXQt::Power::canSuspend() const@Base" 0.9.0+20150911
- (c++)"LXQt::Power::doAction(LXQt::Power::Action)@Base" 0.9.0+20150911
- (c++)"LXQt::Power::hibernate()@Base" 0.9.0+20150911
- (c++)"LXQt::Power::logout()@Base" 0.9.0+20150911
+ (c++)"LXQt::PowerManager::~PowerManager()@Base" 0.9.0+20150911
+ (c++)"LXQt::PowerManager::PowerManager(QObject*, bool)@Base" 0.9.0+20150911
  (c++)"LXQt::PowerManager::availableActions()@Base" 0.9.0+20150911
  (c++)"LXQt::PowerManager::hibernate()@Base" 0.9.0+20150911
  (c++)"LXQt::PowerManager::hibernateFailed()@Base" 0.9.0+20150911
  (c++)"LXQt::PowerManager::logout()@Base" 0.9.0+20150911
  (c++)"LXQt::PowerManager::metaObject() const@Base" 0.9.0+20150911
- (c++)"LXQt::PowerManager::~PowerManager()@Base" 0.9.0+20150911
- (c++)"LXQt::PowerManager::PowerManager(QObject*, bool)@Base" 0.9.0+20150911
  (c++)"LXQt::PowerManager::qt_metacall(QMetaObject::Call, int, void**)@Base" 0.9.0+20150911
  (c++)"LXQt::PowerManager::qt_metacast(char const*)@Base" 0.9.0+20150911
  (c++)"LXQt::PowerManager::reboot()@Base" 0.9.0+20150911
@@ -153,9 +144,19 @@ liblxqt.so.0 liblxqt0 #MINVER#
  (c++)"LXQt::PowerManager::staticMetaObject@Base" 0.9.0+20150911
  (c++)"LXQt::PowerManager::suspend()@Base" 0.9.0+20150911
  (c++)"LXQt::PowerManager::suspendFailed()@Base" 0.9.0+20150911
- (c++)"LXQt::Power::metaObject() const@Base" 0.9.0+20150911
  (c++)"LXQt::Power::~Power()@Base" 0.9.0+20150911
  (c++)"LXQt::Power::Power(QObject*)@Base" 0.9.0+20150911
+ (c++)"LXQt::Power::Power(bool, QObject*)@Base" 0.11.2~
+ (c++)"LXQt::Power::canAction(LXQt::Power::Action) const@Base" 0.9.0+20150911
+ (c++)"LXQt::Power::canHibernate() const@Base" 0.9.0+20150911
+ (c++)"LXQt::Power::canLogout() const@Base" 0.9.0+20150911
+ (c++)"LXQt::Power::canReboot() const@Base" 0.9.0+20150911
+ (c++)"LXQt::Power::canShutdown() const@Base" 0.9.0+20150911
+ (c++)"LXQt::Power::canSuspend() const@Base" 0.9.0+20150911
+ (c++)"LXQt::Power::doAction(LXQt::Power::Action)@Base" 0.9.0+20150911
+ (c++)"LXQt::Power::hibernate()@Base" 0.9.0+20150911
+ (c++)"LXQt::Power::logout()@Base" 0.9.0+20150911
+ (c++)"LXQt::Power::metaObject() const@Base" 0.9.0+20150911
  (c++)"LXQt::Power::qt_metacall(QMetaObject::Call, int, void**)@Base" 0.9.0+20150911
  (c++)"LXQt::Power::qt_metacast(char const*)@Base" 0.9.0+20150911
  (c++)"LXQt::Power::reboot()@Base" 0.9.0+20150911
@@ -165,6 +166,7 @@ liblxqt.so.0 liblxqt0 #MINVER#
  (c++)"LXQt::ProgramFinder::findPrograms(QStringList const&)@Base" 0.9.0+20150911
  (c++)"LXQt::ProgramFinder::programExists(QString const&)@Base" 0.9.0+20150911
  (c++)"LXQt::ProgramFinder::programName(QString const&)@Base" 0.9.0+20150911
+ (c++)"LXQt::RotatedWidget::RotatedWidget(QWidget&, QWidget*, QFlags<Qt::WindowType>)@Base" 0.9.0+20150911
  (c++)"LXQt::RotatedWidget::adjustContentSize()@Base" 0.9.0+20150911
  (c++)"LXQt::RotatedWidget::adjustedPoint(QPoint) const@Base" 0.9.0+20150911
  (c++)"LXQt::RotatedWidget::adjustedSize(QSize) const@Base" 0.9.0+20150911
@@ -182,11 +184,12 @@ liblxqt.so.0 liblxqt0 #MINVER#
  (c++)"LXQt::RotatedWidget::qt_metacall(QMetaObject::Call, int, void**)@Base" 0.9.0+20150911
  (c++)"LXQt::RotatedWidget::qt_metacast(char const*)@Base" 0.9.0+20150911
  (c++)"LXQt::RotatedWidget::resizeEvent(QResizeEvent*)@Base" 0.9.0+20150911
- (c++)"LXQt::RotatedWidget::RotatedWidget(QWidget&, QWidget*, QFlags<Qt::WindowType>)@Base" 0.9.0+20150911
  (c++)"LXQt::RotatedWidget::setOrigin(Qt::Corner)@Base" 0.9.0+20150911
  (c++)"LXQt::RotatedWidget::sizeHint() const@Base" 0.9.0+20150911
  (c++)"LXQt::RotatedWidget::staticMetaObject@Base" 0.9.0+20150911
  (c++)"LXQt::RotatedWidget::wheelEvent(QWheelEvent*)@Base" 0.9.0+20150911
+ (c++)"LXQt::ScreenSaver::~ScreenSaver()@Base" 0.11.0
+ (c++)"LXQt::ScreenSaver::ScreenSaver(QObject*)@Base" 0.9.0+20150911
  (c++)"LXQt::ScreenSaver::activated()@Base" 0.9.0+20150911
  (c++)"LXQt::ScreenSaver::availableActions()@Base" 0.9.0+20150911
  (c++)"LXQt::ScreenSaver::done()@Base" 0.9.0+20150911
@@ -194,14 +197,17 @@ liblxqt.so.0 liblxqt0 #MINVER#
  (c++)"LXQt::ScreenSaver::metaObject() const@Base" 0.9.0+20150911
  (c++)"LXQt::ScreenSaver::qt_metacall(QMetaObject::Call, int, void**)@Base" 0.9.0+20150911
  (c++)"LXQt::ScreenSaver::qt_metacast(char const*)@Base" 0.9.0+20150911
- (c++)"LXQt::ScreenSaver::~ScreenSaver()@Base" 0.11.0
- (c++)"LXQt::ScreenSaver::ScreenSaver(QObject*)@Base" 0.9.0+20150911
  (c++)"LXQt::ScreenSaver::staticMetaObject@Base" 0.9.0+20150911
- (c++)"LXQt::Settings::addWatchedFile(QString const&)@Base" 0.10.0
+ (c++)"LXQt::SettingsCache::SettingsCache(QSettings*)@Base" 0.9.0+20150911
+ (c++)"LXQt::SettingsCache::SettingsCache(QSettings&)@Base" 0.12.0
  (c++)"LXQt::SettingsCache::loadFromSettings()@Base" 0.9.0+20150911
  (c++)"LXQt::SettingsCache::loadToSettings()@Base" 0.9.0+20150911
- (c++)"LXQt::SettingsCache::SettingsCache(QSettings*)@Base" 0.9.0+20150911
- (c++)"LXQt::SettingsCache::SettingsCache(QSettings&)@Base" 0.9.0+20150911
+ (c++)"LXQt::Settings::~Settings()@Base" 0.9.0+20150911
+ (c++)"LXQt::Settings::Settings(QSettings const*, QString const&, QObject*)@Base" 0.9.0+20150911
+ (c++)"LXQt::Settings::Settings(QSettings const&, QString const&, QObject*)@Base" 0.12.0
+ (c++)"LXQt::Settings::Settings(QString const&, QObject*)@Base" 0.9.0+20150911
+ (c++)"LXQt::Settings::Settings(QString const&, QSettings::Format, QObject*)@Base" 0.9.0+20150911
+ (c++)"LXQt::Settings::addWatchedFile(QString const&)@Base" 0.10.0
  (c++)"LXQt::Settings::event(QEvent*)@Base" 0.9.0+20150911
  (c++)"LXQt::Settings::fileChanged()@Base" 0.9.0+20150911
  (c++)"LXQt::Settings::_fileChanged(QString)@Base" 0.9.0+20150911
@@ -211,23 +217,18 @@ liblxqt.so.0 liblxqt0 #MINVER#
  (c++)"LXQt::Settings::qt_metacall(QMetaObject::Call, int, void**)@Base" 0.9.0+20150911
  (c++)"LXQt::Settings::qt_metacast(char const*)@Base" 0.9.0+20150911
  (c++)"LXQt::Settings::setLocalizedValue(QString const&, QVariant const&)@Base" 0.9.0+20150911
- (c++)"LXQt::Settings::~Settings()@Base" 0.9.0+20150911
  (c++)"LXQt::Settings::settingsChanged()@Base" 0.9.0+20150911
  (c++)"LXQt::Settings::settingsChangedByApp()@Base" 0.10.0
  (c++)"LXQt::Settings::settingsChangedFromExternal()@Base" 0.10.0
- (c++)"LXQt::Settings::Settings(QSettings const*, QString const&, QObject*)@Base" 0.9.0+20150911
- (c++)"LXQt::Settings::Settings(QSettings const&, QString const&, QObject*)@Base" 0.9.0+20150911
- (c++)"LXQt::Settings::Settings(QString const&, QObject*)@Base" 0.9.0+20150911
- (c++)"LXQt::Settings::Settings(QString const&, QSettings::Format, QObject*)@Base" 0.9.0+20150911
  (c++)"LXQt::Settings::staticMetaObject@Base" 0.9.0+20150911
+ (c++)"LXQt::SingleApplication::~SingleApplication()@Base" 0.9.0+20150911
+ (c++)"LXQt::SingleApplication::SingleApplication(int&, char**, LXQt::SingleApplication::StartOptions)@Base" 0.9.0+20150911
  (c++)"LXQt::SingleApplication::activateWindow()@Base" 0.9.0+20150911
  (c++)"LXQt::SingleApplication::activationWindow() const@Base" 0.9.0+20150911
  (c++)"LXQt::SingleApplication::metaObject() const@Base" 0.9.0+20150911
  (c++)"LXQt::SingleApplication::qt_metacall(QMetaObject::Call, int, void**)@Base" 0.9.0+20150911
  (c++)"LXQt::SingleApplication::qt_metacast(char const*)@Base" 0.9.0+20150911
  (c++)"LXQt::SingleApplication::setActivationWindow(QWidget*)@Base" 0.9.0+20150911
- (c++)"LXQt::SingleApplication::~SingleApplication()@Base" 0.9.0+20150911
- (c++)"LXQt::SingleApplication::SingleApplication(int&, char**, LXQt::SingleApplication::StartOptions)@Base" 0.9.0+20150911
  (c++)"LXQt::SingleApplication::staticMetaObject@Base" 0.9.0+20150911
  (c++)"LXQt::Translator::setTranslationSearchPaths(QStringList const&)@Base" 0.9.0+20150911
  (c++)"LXQt::Translator::translateApplication(QString const&)@Base" 0.9.0+20150911
@@ -272,7 +273,7 @@ liblxqt.so.0 liblxqt0 #MINVER#
  (c++)"typeinfo name for LXQt::Settings@Base" 0.9.0+20150911
  (c++)"typeinfo name for LXQt::SettingsCache@Base" 0.9.0+20150911
  (c++)"typeinfo name for LXQt::SingleApplication@Base" 0.9.0+20150911
- (optional|c++)"void std::vector<int, std::allocator<int> >::_M_emplace_back_aux<int>(int&&)@Base" 0.11.0
+ (c++)"void std::vector<int, std::allocator<int> >::_M_realloc_insert<int>(__gnu_cxx::__normal_iterator<int*, std::vector<int, std::allocator<int> > >, int&&)@Base" 0.12.0
  (c++)"vtable for LXQt::Application@Base" 0.9.0+20150911
  (c++)"vtable for LXQt::AutostartEntry@Base" 0.9.0+20150911
  (c++)"vtable for LXQt::ConfigDialog@Base" 0.9.0+20150911
diff --git a/debian/rules b/debian/rules
index 9f98619..5f6e202 100755
--- a/debian/rules
+++ b/debian/rules
@@ -6,8 +6,10 @@ export DEB_LDFLAGS_MAINT_APPEND = -Wl,--as-needed
 export DEB_BUILD_MAINT_OPTIONS = hardening=+all
 
 %:
-	dh ${@} --buildsystem cmake \
-		--fail-missing
+	dh ${@} --buildsystem cmake
+
+override_dh_missing:
+	dh_missing --fail-missing
 
 override_dh_auto_configure:
 	dh_auto_configure -- \
diff --git a/lxqtapplication.cpp b/lxqtapplication.cpp
index 2c7c0a3..733db45 100644
--- a/lxqtapplication.cpp
+++ b/lxqtapplication.cpp
@@ -57,6 +57,7 @@ variable LXQT_DEBUG set
 */
 void dbgMessageOutput(QtMsgType type, const QMessageLogContext &ctx, const QString & msgStr)
 {
+    Q_UNUSED(ctx)
     QByteArray msgBuf = msgStr.toUtf8();
     const char* msg = msgBuf.constData();
     QDir dir(XdgDirs::configHome().toUtf8() + QLatin1String("/lxqt"));
@@ -84,12 +85,12 @@ void dbgMessageOutput(QtMsgType type, const QMessageLogContext &ctx, const QStri
 
     QByteArray dt = QDateTime::currentDateTime().toString("yyyy-MM-dd hh:mm:ss.zzz").toUtf8();
     if (isatty(STDERR_FILENO))
-        fprintf(stderr, "%s %s(%p) %s: %s%s\n", color, QAPP_NAME, qApp, typestr, msg, COLOR_RESET);
+        fprintf(stderr, "%s %s(%p) %s: %s%s\n", color, QAPP_NAME, static_cast<void *>(qApp), typestr, msg, COLOR_RESET);
     else
-        fprintf(stderr, "%s(%p) %s: %s\n", QAPP_NAME, qApp, typestr, msg);
+        fprintf(stderr, "%s(%p) %s: %s\n", QAPP_NAME, static_cast<void *>(qApp), typestr, msg);
 
     FILE *f = fopen(dir.absoluteFilePath("debug.log").toUtf8().constData(), "a+");
-    fprintf(f, "%s %s(%p) %s: %s\n", dt.constData(), QAPP_NAME, qApp, typestr, msg);
+    fprintf(f, "%s %s(%p) %s: %s\n", dt.constData(), QAPP_NAME, static_cast<void *>(qApp), typestr, msg);
     fclose(f);
 
     if (type == QtFatalMsg)
@@ -102,7 +103,7 @@ Application::Application(int &argc, char** argv)
 #ifdef DEBUG
     qInstallMessageHandler(dbgMessageOutput);
 #else
-    if (!qgetenv("LXQT_DEBUG").isNull())
+    if (!qEnvironmentVariableIsSet("LXQT_DEBUG"))
         qInstallMessageHandler(dbgMessageOutput);
 #endif
 
@@ -128,7 +129,7 @@ Application::Application(int &argc, char** argv, bool handleQuitSignals)
 
 void Application::updateTheme()
 {
-    QString styleSheetKey = QFileInfo(applicationFilePath()).fileName();
+    const QString styleSheetKey = QFileInfo(applicationFilePath()).fileName();
     setStyleSheet(lxqtTheme.qss(styleSheetKey));
     emit themeChanged();
 }
@@ -140,14 +141,14 @@ namespace
     public:
         static void signalHandler(int signo)
         {
-            int ret = write(instance->mSignalSock[0], &signo, sizeof (int));
+            const int ret = write(instance->mSignalSock[0], &signo, sizeof (int));
             if (sizeof (int) != ret)
                 qCritical() << QStringLiteral("unable to write into socketpair, %1").arg(strerror(errno));
         } 
 
     public:
         template <class Lambda>
-        SignalHandler(Lambda signalEmitter)
+        SignalHandler(Application * app, Lambda signalEmitter)
             : mSignalSock{-1, -1}
         {
             if (0 != socketpair(AF_UNIX, SOCK_STREAM, 0, mSignalSock))
@@ -157,7 +158,7 @@ namespace
             }
 
             mNotifier.reset(new QSocketNotifier(mSignalSock[1], QSocketNotifier::Read));
-            QObject::connect(mNotifier.data(), &QSocketNotifier::activated, [this, signalEmitter] {
+            QObject::connect(mNotifier.data(), &QSocketNotifier::activated, app, [this, signalEmitter] {
                 int signo = 0;
                 int ret = read(mSignalSock[1], &signo, sizeof (int));
                 if (sizeof (int) != ret)
@@ -198,6 +199,6 @@ void Application::listenToUnixSignals(QList<int> const & signoList)
     static QScopedPointer<QSocketNotifier> signal_notifier;
 
     if (SignalHandler::instance.isNull())
-        SignalHandler::instance.reset(new SignalHandler{[this] (int signo) { emit unixSignal(signo); }});
+        SignalHandler::instance.reset(new SignalHandler{this, [this] (int signo) { emit unixSignal(signo); }});
     SignalHandler::instance->listenToSignals(signoList);
 }
diff --git a/lxqtautostartentry.cpp b/lxqtautostartentry.cpp
index f977a75..379f297 100644
--- a/lxqtautostartentry.cpp
+++ b/lxqtautostartentry.cpp
@@ -38,9 +38,10 @@ AutostartEntry::AutostartEntry() :
 AutostartEntry::AutostartEntry(const QString& name):
     mLocalState(StateNone), mSystem(false)
 {
-    foreach (const QString& dir, XdgDirs::autostartDirs())
+    const QStringList& dirs = XdgDirs::autostartDirs();
+    foreach (const QString& dir, dirs)
     {
-        QString path = QString("%1/%2").arg(dir, name);
+        const QString path = QString("%1/%2").arg(dir, name);
         if (QFile(path).exists())
         {
             mSystemFile.load(path);
@@ -49,7 +50,7 @@ AutostartEntry::AutostartEntry(const QString& name):
         }
     }
 
-    QString path = QString("%1/%2").arg(XdgDirs::autostartHome(), name);
+    const QString path = QString("%1/%2").arg(XdgDirs::autostartHome(), name);
     if (QFile(path).exists())
     {
         mLocalFile.load(path);
@@ -59,7 +60,7 @@ AutostartEntry::AutostartEntry(const QString& name):
 
 void AutostartEntry::setFile(const XdgDesktopFile& file)
 {
-    bool local = isLocal();
+    const bool local = isLocal();
     if (mSystem && local && file == mSystemFile)
     {
         removeLocal();
diff --git a/lxqtgridlayout.cpp b/lxqtgridlayout.cpp
index 94861fc..739178e 100644
--- a/lxqtgridlayout.cpp
+++ b/lxqtgridlayout.cpp
@@ -131,7 +131,8 @@ void GridLayoutPrivate::updateCache()
     mCellMaxSize = QSize(0, 0);
     mVisibleCount = 0;
 
-    for (int i=0; i<mItems.count(); ++i)
+    const int N = mItems.count();
+    for (int i=0; i < N; ++i)
     {
         QLayoutItem *item = mItems.at(i);
         if (!item->widget() || item->widget()->isHidden())
diff --git a/lxqthtmldelegate.cpp b/lxqthtmldelegate.cpp
index 5f1c694..9a5e7bf 100644
--- a/lxqthtmldelegate.cpp
+++ b/lxqthtmldelegate.cpp
@@ -65,7 +65,7 @@ void HtmlDelegate::paint(QPainter* painter, const QStyleOptionViewItem& option,
     options.icon = QIcon();
 
     // icon size
-    QSize iconSize = icon.actualSize(mIconSize);
+    const QSize iconSize = icon.actualSize(mIconSize);
     QRect iconRect = QRect(8, 8, iconSize.width(), iconSize.height());
     if (is_right_to_left)
     {
@@ -86,7 +86,7 @@ void HtmlDelegate::paint(QPainter* painter, const QStyleOptionViewItem& option,
         // shift text right to make icon visible
         painter->translate(iconRect.right() + 8, 0);
     }
-    QRect clip(0, 0, options.rect.width() - iconRect.width() - 8, options.rect.height());
+    const QRect clip(0, 0, options.rect.width() - iconRect.width() - 8, options.rect.height());
     painter->setClipRect(clip);
 
     // set text color to red for selected item
@@ -112,11 +112,16 @@ QSize HtmlDelegate::sizeHint(const QStyleOptionViewItem& option, const QModelInd
     QStyleOptionViewItem options = option;
     initStyleOption(&options, index);
 
-    QSize iconSize = options.icon.actualSize(mIconSize);
-    QRect iconRect = QRect(8, 8, iconSize.width(), iconSize.height());
+    const QSize iconSize = options.icon.actualSize(mIconSize);
+    const QRect iconRect = QRect(8, 8, iconSize.width(), iconSize.height());
+    const QSize optSize = options.rect.size();
 
     QTextDocument doc;
     doc.setHtml(options.text);
-    doc.setTextWidth(options.rect.width() - iconRect.right() - 8);
-    return QSize(options.rect.width(), doc.size().height() + 8);
+
+    if (optSize.width() > 0)
+        doc.setTextWidth(optSize.width() - iconRect.right() - 8);
+    doc.adjustSize();
+    return QSize(0 < optSize.width() ? optSize.width() : iconRect.width() + 8 + qRound(doc.size().width())
+            , qMax(qRound(doc.size().height()), iconSize.height()) + 8);
 }
diff --git a/lxqtnotification.cpp b/lxqtnotification.cpp
index d26f25f..1dc3935 100644
--- a/lxqtnotification.cpp
+++ b/lxqtnotification.cpp
@@ -158,7 +158,8 @@ void NotificationPrivate::setActions(QStringList actions, int defaultAction)
 {
     mActions.clear();
     mDefaultAction = defaultAction;
-    for (int ix = 0; ix < actions.size(); ix++)
+    const int N = actions.size();
+    for (int ix = 0; ix < N; ix++)
     {
         if (ix == defaultAction)
             mActions.append("default");
diff --git a/lxqtplugininfo.cpp b/lxqtplugininfo.cpp
index 1f3ed78..c02888a 100644
--- a/lxqtplugininfo.cpp
+++ b/lxqtplugininfo.cpp
@@ -72,12 +72,11 @@ bool PluginInfo::isValid() const
  ************************************************/
 QLibrary* PluginInfo::loadLibrary(const QString& libDir) const
 {
-    QString baseName, path;
-    QFileInfo fi = QFileInfo(fileName());
-    path = fi.canonicalPath();
-    baseName = value("X-LXQt-Library", fi.completeBaseName()).toString();
+    const QFileInfo fi = QFileInfo(fileName());
+    const QString path = fi.canonicalPath();
+    const QString baseName = value("X-LXQt-Library", fi.completeBaseName()).toString();
 
-    QString soPath = QDir(libDir).filePath(QString("lib%2.so").arg(baseName));
+    const QString soPath = QDir(libDir).filePath(QString("lib%2.so").arg(baseName));
     QLibrary* library = new QLibrary(soPath);
 
     if (!library->load())
@@ -87,7 +86,7 @@ QLibrary* PluginInfo::loadLibrary(const QString& libDir) const
         return 0;
     }
 
-    QString locale = QLocale::system().name();
+    const QString locale = QLocale::system().name();
     QTranslator* translator = new QTranslator(library);
 
     translator->load(QString("%1/%2/%2_%3.qm").arg(path, baseName, locale));
@@ -107,8 +106,8 @@ PluginInfoList PluginInfo::search(const QStringList& desktopFilesDirs, const QSt
 
     foreach (const QString &desktopFilesDir, desktopFilesDirs)
     {
-        QDir dir(desktopFilesDir);
-        QFileInfoList files = dir.entryInfoList(QStringList(nameFilter), QDir::Files | QDir::Readable);
+        const QDir dir(desktopFilesDir);
+        const QFileInfoList files = dir.entryInfoList(QStringList(nameFilter), QDir::Files | QDir::Readable);
         foreach (const QFileInfo &file, files)
         {
             if (processed.contains(file.fileName()))
diff --git a/lxqtpower/lxqtpower.cpp b/lxqtpower/lxqtpower.cpp
index 742793b..07cd19e 100644
--- a/lxqtpower/lxqtpower.cpp
+++ b/lxqtpower/lxqtpower.cpp
@@ -33,15 +33,21 @@
 
 using namespace LXQt;
 
-Power::Power(QObject *parent) :
+Power::Power(bool useLxqtSessionProvider, QObject * parent /*= nullptr*/) :
     QObject(parent)
 {
     mProviders.append(new CustomProvider(this));
+    if (useLxqtSessionProvider)
+        mProviders.append(new LXQtProvider(this));
     mProviders.append(new SystemdProvider(this));
     mProviders.append(new UPowerProvider(this));
     mProviders.append(new ConsoleKitProvider(this));
     mProviders.append(new LxSessionProvider(this));
-    mProviders.append(new LXQtProvider(this));
+}
+
+Power::Power(QObject * parent /*= nullptr*/)
+    : Power(true, parent)
+{
 }
 
 
diff --git a/lxqtpower/lxqtpower.h b/lxqtpower/lxqtpower.h
index f738b46..98b021e 100644
--- a/lxqtpower/lxqtpower.h
+++ b/lxqtpower/lxqtpower.h
@@ -56,8 +56,16 @@ public:
         PowerSuspend    /// Suspend the computer
     };
 
-    /// Constructs a Power with parent.
-    explicit Power(QObject *parent = 0);
+    /*!
+     * Constructs the Power object.
+     * \param useLxqtSessionProvider indicates if the DBus methods
+     * provided by lxqt-session should be considered. This is useful to
+     * avoid recursion if the lxqt-session wants to provide some of the
+     * methods by itself with internal use of this object.
+     */
+    explicit Power(bool useLxqtSessionProvider, QObject *parent = nullptr);
+    /// Constructs a Power with using the lxqt-session provider.
+    explicit Power(QObject *parent = nullptr);
 
     /// Destroys the object.
     virtual ~Power();
diff --git a/lxqtpower/lxqtpowerproviders.cpp b/lxqtpower/lxqtpowerproviders.cpp
index 5379281..3907cc7 100644
--- a/lxqtpower/lxqtpowerproviders.cpp
+++ b/lxqtpower/lxqtpowerproviders.cpp
@@ -107,8 +107,8 @@ static bool dbusCall(const QString &service,
 
     // If the method no returns value, we believe that it was successful.
     return msg.arguments().isEmpty() ||
-           msg.arguments().first().isNull() ||
-           msg.arguments().first().toBool();
+           msg.arguments().constFirst().isNull() ||
+           msg.arguments().constFirst().toBool();
 }
 
 /************************************************
@@ -156,10 +156,10 @@ static bool dbusCallSystemd(const QString &service,
     }
 
     // If the method no returns value, we believe that it was successful.
-    if (msg.arguments().isEmpty() || msg.arguments().first().isNull())
+    if (msg.arguments().isEmpty() || msg.arguments().constFirst().isNull())
         return true;
 
-    QString response = msg.arguments().first().toString();
+    QString response = msg.arguments().constFirst().toString();
     qDebug() << "systemd:" << method << "=" << response;
     return response == "yes" || response == "challenge";
 }
@@ -199,7 +199,7 @@ bool dbusGetProperty(const QString &service,
     }
 
     return !msg.arguments().isEmpty() &&
-            msg.arguments().first().value<QDBusVariant>().variant().toBool();
+            msg.arguments().constFirst().value<QDBusVariant>().variant().toBool();
 }
 
 
@@ -500,31 +500,45 @@ LXQtProvider::~LXQtProvider()
 
 bool LXQtProvider::canAction(Power::Action action) const
 {
+    QString command;
     switch (action)
     {
         case Power::PowerLogout:
-            // there can be case when razo-session does not run
-            return dbusCall(LXQT_SERVICE, LXQT_PATH, LXQT_SERVICE,
-                            QDBusConnection::sessionBus(), "canLogout",
-                            PowerProvider::DontCheckDBUS);
+            command = "canLogout";
+            break;
+        case Power::PowerReboot:
+            command = "canReboot";
+            break;
+        case Power::PowerShutdown:
+            command = "canPowerOff";
+            break;
         default:
             return false;
     }
+
+    // there can be case when lxqtsession-session does not run
+    return dbusCall(LXQT_SERVICE, LXQT_PATH, LXQT_SERVICE,
+            QDBusConnection::sessionBus(), command,
+            PowerProvider::DontCheckDBUS);
 }
 
 
 bool LXQtProvider::doAction(Power::Action action)
 {
     QString command;
-
     switch (action)
     {
-    case Power::PowerLogout:
-        command = "logout";
-        break;
-
-    default:
-        return false;
+        case Power::PowerLogout:
+            command = "logout";
+            break;
+        case Power::PowerReboot:
+            command = "reboot";
+            break;
+        case Power::PowerShutdown:
+            command = "powerOff";
+            break;
+        default:
+            return false;
     }
 
     return dbusCall(LXQT_SERVICE,
@@ -594,12 +608,14 @@ HalProvider::~HalProvider()
 
 bool HalProvider::canAction(Power::Action action) const
 {
+    Q_UNUSED(action)
     return false;
 }
 
 
 bool HalProvider::doAction(Power::Action action)
 {
+    Q_UNUSED(action)
     return false;
 }
 
diff --git a/lxqtpowermanager.cpp b/lxqtpowermanager.cpp
index 4f14ff7..0258c64 100644
--- a/lxqtpowermanager.cpp
+++ b/lxqtpowermanager.cpp
@@ -41,14 +41,14 @@ namespace LXQt {
 
 class LXQT_API MessageBox: public QMessageBox
 {
-    Q_DECLARE_TR_FUNCTIONS(LXQt::MessageBox);
+    Q_DECLARE_TR_FUNCTIONS(LXQt::MessageBox)
 
 public:
     explicit MessageBox(QWidget *parent = 0): QMessageBox(parent) {}
 
     static QWidget *parentWidget()
     {
-        QWidgetList widgets = QApplication::topLevelWidgets();
+        const QWidgetList widgets = QApplication::topLevelWidgets();
 
         if (widgets.count())
             return widgets.at(0);
@@ -69,6 +69,8 @@ public:
 
     static void warning(const QString& title, const QString& text)
     {
+        Q_UNUSED(title)
+        Q_UNUSED(text)
         QMessageBox::warning(parentWidget(), tr("LXQt Power Manager Error"), tr("Hibernate failed."));
     }
 
@@ -76,7 +78,8 @@ public:
 protected:
     virtual void resizeEvent(QResizeEvent* event)
     {
-        QRect screen = QApplication::desktop()->screenGeometry();
+        Q_UNUSED(event)
+        const QRect screen = QApplication::desktop()->screenGeometry();
         move((screen.width()  - this->width()) / 2,
              (screen.height() - this->height()) / 2);
 
diff --git a/lxqtprogramfinder.cpp b/lxqtprogramfinder.cpp
index 2d8f53c..0465aa3 100644
--- a/lxqtprogramfinder.cpp
+++ b/lxqtprogramfinder.cpp
@@ -31,17 +31,17 @@ using namespace LXQt;
 
 LXQT_API bool ProgramFinder::programExists(const QString& command)
 {
-    QString program = programName(command);
+    const QString program = programName(command);
     if (program[0] == QChar('/'))
     {
         QFileInfo fi(program);
         return fi.isExecutable() && fi.isFile();
     }
 
-    QString path = qgetenv("PATH");
+    const QString path = qgetenv("PATH");
     foreach (const QString& dirName, path.split(":", QString::SkipEmptyParts))
     {
-        QFileInfo fi(QDir(dirName), program);
+        const QFileInfo fi(QDir(dirName), program);
         if (fi.isExecutable() && fi.isFile())
             return true;
     }
diff --git a/lxqtrotatedwidget.cpp b/lxqtrotatedwidget.cpp
index ec6f284..384eb84 100644
--- a/lxqtrotatedwidget.cpp
+++ b/lxqtrotatedwidget.cpp
@@ -90,7 +90,7 @@ void RotatedWidget::adjustContentSize()
 {
     mContent->adjustSize();
 
-    QSize before = size();
+    const QSize before = size();
 
     adjustSize();
 
@@ -147,7 +147,7 @@ void RotatedWidget::paintEvent(QPaintEvent */*event*/)
     if (mOrigin == Qt::TopLeftCorner)
         return;
 
-    QSize sz = mContent->size();
+    const QSize sz = mContent->size();
 
     QPainter painter(this);
 
diff --git a/lxqtscreensaver.cpp b/lxqtscreensaver.cpp
index c38e46b..3907578 100644
--- a/lxqtscreensaver.cpp
+++ b/lxqtscreensaver.cpp
@@ -124,7 +124,7 @@ static bool GetIntArrayProperty(XID window,
 
 class ScreenSaverPrivate
 {
-    Q_DECLARE_TR_FUNCTIONS(LXQt::ScreenSaver);
+    Q_DECLARE_TR_FUNCTIONS(LXQt::ScreenSaver)
     Q_DECLARE_PUBLIC(ScreenSaver)
     ScreenSaver* const q_ptr;
 
@@ -141,6 +141,7 @@ void ScreenSaverPrivate::_l_xdgProcess_finished(int err, QProcess::ExitStatus st
 {
     // http://portland.freedesktop.org/xdg-utils-1.1.0-rc1/scripts/xdg-screensaver
 
+    Q_UNUSED(status)
     Q_Q(ScreenSaver);
     if (err == 0)
         emit q->activated();
diff --git a/lxqtsettings.cpp b/lxqtsettings.cpp
index b3d6989..7ef3506 100644
--- a/lxqtsettings.cpp
+++ b/lxqtsettings.cpp
@@ -80,7 +80,8 @@ public:
                     if (dir.cd(mParent->organizationName()) && dir.exists(file_name))
                     {
                         QSettings system_settings{dir.absoluteFilePath(file_name), QSettings::IniFormat};
-                        for (const QString & key : system_settings.allKeys())
+                        const QStringList keys = system_settings.allKeys();
+                        for (const QString & key : keys)
                         {
                             mParent->setValue(key, system_settings.value(key));
                         }
diff --git a/lxqtsingleapplication.h b/lxqtsingleapplication.h
index cc37a50..7ae80ee 100644
--- a/lxqtsingleapplication.h
+++ b/lxqtsingleapplication.h
@@ -77,7 +77,6 @@ namespace LXQt {
 
 class LXQT_API SingleApplication : public Application {
     Q_OBJECT
-    Q_ENUMS(StartOptions)
 
 public:
     /*!
@@ -101,6 +100,7 @@ public:
         /** Don't exit if the connection to the D-Bus session bus fails.*/
         NoExitOnDBusFailure
     };
+    Q_ENUM(StartOptions)
 
     /*!
      * \brief Construct a LXQt SingleApplication object.
@@ -153,6 +153,6 @@ private:
 #endif
 #define lxqtSingleApp (static_cast<LXQt::SingleApplication *>(qApp))
 
-}; // namespace LXQt
+} // namespace LXQt
 
 #endif // LXQTSINGLEAPPLICATION_H
diff --git a/lxqttranslator.cpp b/lxqttranslator.cpp
index 4fc67c0..d022874 100644
--- a/lxqttranslator.cpp
+++ b/lxqttranslator.cpp
@@ -51,8 +51,8 @@ QStringList *getSearchPaths()
     if (searchPath == 0)
     {
         searchPath = new QStringList();
-        *searchPath << QString(LXQT_SHARE_TRANSLATIONS_DIR);
         *searchPath << XdgDirs::dataDirs(QLatin1Char('/') % LXQT_RELATIVE_SHARE_TRANSLATIONS_DIR);
+        *searchPath << QString(LXQT_SHARE_TRANSLATIONS_DIR);
         searchPath->removeDuplicates();
     }
 
@@ -85,7 +85,7 @@ void Translator::setTranslationSearchPaths(const QStringList &paths)
  ************************************************/
 bool translate(const QString &name, const QString &owner)
 {
-    QString locale = QLocale::system().name();
+    const QString locale = QLocale::system().name();
     QTranslator *appTranslator = new QTranslator(qApp);
 
     QStringList *paths = getSearchPaths();
@@ -132,7 +132,7 @@ bool translate(const QString &name, const QString &owner)
  ************************************************/
 bool Translator::translateApplication(const QString &applicationName)
 {
-    QString locale = QLocale::system().name();
+    const QString locale = QLocale::system().name();
     QTranslator *qtTranslator = new QTranslator(qApp);
 
     if (qtTranslator->load("qt_" + locale, QLibraryInfo::location(QLibraryInfo::TranslationsPath)))
@@ -170,7 +170,7 @@ bool Translator::translatePlugin(const QString &pluginName, const QString& type)
 {
     static QSet<QString> loadedPlugins;
 
-    QString fullName = type % QChar('/') % pluginName;
+    const QString fullName = type % QChar('/') % pluginName;
     if (loadedPlugins.contains(fullName))
         return true;