QtLauncher: fix build with Qt < 5.4

diff --git a/src/GUI/QtLauncher.cxx b/src/GUI/QtLauncher.cxx
index 9a1a23f9080a18340f32e39fffa01a142f368d9e..2d126ede1405039fe6b3545bef5675a0e3c7d6be 100644 (file)
--- a/src/GUI/QtLauncher.cxx
+++ b/src/GUI/QtLauncher.cxx
@@ -299,7 +299,7 @@ private:
             deleteLater(); // commit suicide
         } else {
             m_lineInsertCount += 1000;
-            QTimer::singleShot(50, this, &NaturalEarthDataLoaderThread::onFinished);
+            QTimer::singleShot(50, this, SLOT(onFinished()));
         }
     }