diff --git a/thirdparty/qtsingleapplication/src/qtsingleapplication.cpp b/thirdparty/qtsingleapplication/src/qtsingleapplication.cpp
index 48bb4585..86adc112 100644
--- a/thirdparty/qtsingleapplication/src/qtsingleapplication.cpp
+++ b/thirdparty/qtsingleapplication/src/qtsingleapplication.cpp
@@ -170,62 +170,6 @@ QtSingleApplication::QtSingleApplication(const QString &appId, int &argc, char *
     sysInit(appId);
 }
 
-#if QT_VERSION < 0x050000
-
-/*!
-    Creates a QtSingleApplication object. The application identifier
-    will be QCoreApplication::applicationFilePath(). \a argc, \a
-    argv, and \a type are passed on to the QAppliation constructor.
-*/
-QtSingleApplication::QtSingleApplication(int &argc, char **argv, Type type)
-    : QApplication(argc, argv, type)
-{
-    sysInit();
-}
-
-
-#  if defined(HAVE_X11)
-/*!
-  Special constructor for X11, ref. the documentation of
-  QApplication's corresponding constructor. The application identifier
-  will be QCoreApplication::applicationFilePath(). \a dpy, \a visual,
-  and \a cmap are passed on to the QApplication constructor.
-*/
-QtSingleApplication::QtSingleApplication(Display* dpy, Qt::HANDLE visual, Qt::HANDLE cmap)
-    : QApplication(dpy, visual, cmap)
-{
-    sysInit();
-}
-
-/*!
-  Special constructor for X11, ref. the documentation of
-  QApplication's corresponding constructor. The application identifier
-  will be QCoreApplication::applicationFilePath(). \a dpy, \a argc, \a
-  argv, \a visual, and \a cmap are passed on to the QApplication
-  constructor.
-*/
-QtSingleApplication::QtSingleApplication(Display *dpy, int &argc, char **argv, Qt::HANDLE visual, Qt::HANDLE cmap)
-    : QApplication(dpy, argc, argv, visual, cmap)
-{
-    sysInit();
-}
-
-/*!
-  Special constructor for X11, ref. the documentation of
-  QApplication's corresponding constructor. The application identifier
-  will be \a appId. \a dpy, \a argc, \a
-  argv, \a visual, and \a cmap are passed on to the QApplication
-  constructor.
-*/
-QtSingleApplication::QtSingleApplication(Display* dpy, const QString &appId, int argc, char **argv, Qt::HANDLE visual, Qt::HANDLE cmap)
-    : QApplication(dpy, argc, argv, visual, cmap)
-{
-    sysInit(appId);
-}
-#  endif // HAVE_X11
-#endif // QT_VERSION < 0x050000
-
-
 /*!
     Returns true if another instance of this application is running;
     otherwise false.