diff -urNr owncloudclient-2.4.0-orig/src/3rdparty/qtsingleapplication/qtlocalpeer.h owncloudclient-2.4.0/src/3rdparty/qtsingleapplication/qtlocalpeer.h
--- owncloudclient-2.4.0-orig/src/3rdparty/qtsingleapplication/qtlocalpeer.h	2017-12-20 18:42:11.000000000 +0100
+++ owncloudclient-2.4.0/src/3rdparty/qtsingleapplication/qtlocalpeer.h	2018-02-13 22:23:26.772426256 +0100
@@ -27,7 +27,7 @@
 **
 ****************************************************************************/
 
-#include <qtlockedfile.h>
+#include <QTSolutions/qtlockedfile.h>
 
 #include <QLocalServer>
 #include <QLocalSocket>
diff -urNr owncloudclient-2.4.0-orig/src/gui/application.cpp owncloudclient-2.4.0/src/gui/application.cpp
--- owncloudclient-2.4.0-orig/src/gui/application.cpp	2017-12-20 18:42:11.000000000 +0100
+++ owncloudclient-2.4.0/src/gui/application.cpp	2018-02-13 22:25:51.846015381 +0100
@@ -95,7 +95,7 @@ namespace {
 // ----------------------------------------------------------------------------------
 
 Application::Application(int &argc, char **argv)
-    : SharedTools::QtSingleApplication(Theme::instance()->appName(), argc, argv)
+    : QtSingleApplication(Theme::instance()->appName(), argc, argv)
     , _gui(0)
     , _theme(Theme::instance())
     , _helpOnly(false)
@@ -150,7 +150,7 @@ Application::Application(int &argc, char **argv)
 
     _folderManager.reset(new FolderMan);
 
-    connect(this, &SharedTools::QtSingleApplication::messageReceived, this, &Application::slotParseMessage);
+    connect(this, &QtSingleApplication::messageReceived, this, &Application::slotParseMessage);
 
     if (!AccountManager::instance()->restore()) {
         // If there is an error reading the account settings, try again
@@ -363,7 +363,7 @@ void Application::slotUseMonoIconsChange
     _gui->slotComputeOverallSyncStatus();
 }
 
-void Application::slotParseMessage(const QString &msg, QObject *)
+void Application::slotParseMessage(const QString &msg)
 {
     if (msg.startsWith(QLatin1String("MSG_PARSEOPTIONS:"))) {
         const int lengthOfMsgPrefix = 17;
diff -urNr owncloudclient-2.4.0-orig/src/gui/application.h owncloudclient-2.4.0/src/gui/application.h
--- owncloudclient-2.4.0-orig/src/gui/application.h	2017-12-20 18:42:11.000000000 +0100
+++ owncloudclient-2.4.0/src/gui/application.h	2018-02-13 22:27:18.007583524 +0100
@@ -22,7 +22,7 @@
 #include <QElapsedTimer>
 #include <QNetworkConfigurationManager>
 
-#include "qtsingleapplication.h"
+#include "QtSolutions/QtSingleApplication"
 
 #include "syncresult.h"
 #include "logbrowser.h"
@@ -52,7 +52,7 @@
  * @brief The Application class
  * @ingroup gui
  */
-class Application : public SharedTools::QtSingleApplication
+class Application : public QtSingleApplication
 {
     Q_OBJECT
 public:
@@ -85,7 +85,7 @@ signals:
     void folderStateChanged(Folder *);
 
 protected slots:
-    void slotParseMessage(const QString &, QObject *);
+    void slotParseMessage(const QString &);
     void slotCheckConnection();
     void slotUseMonoIconsChanged(bool);
     void slotCleanup();

diff -urNr owncloudclient-2.4.0-orig/src/gui/CMakeLists.txt owncloudclient-2.4.0/src/gui/CMakeLists.txt
--- owncloudclient-2.4.0-orig/src/gui/CMakeLists.txt	2017-12-20 18:42:11.000000000 +0100
+++ owncloudclient-2.4.0/src/gui/CMakeLists.txt	2018-02-13 22:29:10.917707151 +0100
@@ -152,10 +152,6 @@
 
 set(3rdparty_SRC
     ../3rdparty/QProgressIndicator/QProgressIndicator.cpp
-    ../3rdparty/qtlockedfile/qtlockedfile.cpp
-    ../3rdparty/qtsingleapplication/qtlocalpeer.cpp
-    ../3rdparty/qtsingleapplication/qtsingleapplication.cpp
-    ../3rdparty/qtsingleapplication/qtsinglecoreapplication.cpp
    )
 
 if (APPLE)
@@ -166,17 +162,9 @@
         )
 endif()
 
-if(NOT WIN32)
-   list(APPEND 3rdparty_SRC ../3rdparty/qtlockedfile/qtlockedfile_unix.cpp)
-else()
-   list(APPEND 3rdparty_SRC ../3rdparty/qtlockedfile/qtlockedfile_win.cpp )
-endif()
-
 set(3rdparty_INC
     ${CMAKE_SOURCE_DIR}/src/3rdparty/QProgressIndicator
-    ${CMAKE_SOURCE_DIR}/src/3rdparty/qtlockedfile
     ${CMAKE_SOURCE_DIR}/src/3rdparty/qtmacgoodies/src
-    ${CMAKE_SOURCE_DIR}/src/3rdparty/qtsingleapplication
     )
 
 include_directories(${3rdparty_INC})
@@ -303,6 +291,8 @@
 target_link_libraries( ${APPLICATION_EXECUTABLE} ${QT_LIBRARIES} )
 target_link_libraries( ${APPLICATION_EXECUTABLE} ${synclib_NAME} )
 target_link_libraries( ${APPLICATION_EXECUTABLE} updater )
+target_link_libraries( ${APPLICATION_EXECUTABLE} Qt5Solutions_LockedFile-2.4 )
+target_link_libraries( ${APPLICATION_EXECUTABLE} Qt5Solutions_SingleApplication-2.6 )
 target_link_libraries( ${APPLICATION_EXECUTABLE} ${OS_SPECIFIC_LINK_LIBRARIES} )
 
 if(WITH_CRASHREPORTER)