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--- a/src/qtgui/rclm_idx.cpp
+++ b/src/qtgui/rclm_idx.cpp
@@ -317,7 +317,7 @@
 {
     QEventLoop loop;
     QTimer t;
-    t.connect(&t, &QTimer::timeout, &loop, &QEventLoop::quit);
+    t.connect(&t, SIGNAL(timeout()), &loop, SLOT(quit()));
     t.start(millisecondsWait);
     loop.exec();
 }