Set compat Qt6
diff --git a/designerPlugin/designerPlugin.pro b/designerPlugin/designerPlugin.pro
index 0bc3714..e8e2fec 100644
--- a/designerPlugin/designerPlugin.pro
+++ b/designerPlugin/designerPlugin.pro
@@ -26,7 +26,7 @@ INSTALLS += target
 HEADERS = qglviewerPlugin.h
 SOURCES = qglviewerPlugin.cpp
 
-equals (QT_MAJOR_VERSION, 5) {
+greaterThan (QT_MAJOR_VERSION, 5) {
   QT *= designer
   CONFIG *= release
   OTHER_FILES += designerplugindescription.json