Links Qt6 WebSockets in LtsWebSocketCommon when real

qt6-after/qt6-migrated-legatus/Lts/Common/LtsWebSocket/CMakeLists.txt

@@ -8,8 +8,15 @@
 # --- Library LtsWebSocketCommon --------------------------------------------------------------------------------
 #
 # Make ${Qt6_WebSockets} optional
-if(QT6_GUI_AVAILABLE AND TARGET Qt6::WebSockets)
-  set(Qt6_WebSockets ${Qt6_WebSockets})
+# Link the real WebSockets module whenever the websocket code path is
+# compiled: QT6_WEBSOCKETS_AVAILABLE (root CMakeLists) and the manual
+# Qt6::WebSockets import are set when the real module was found. The old
+# QT6_GUI_AVAILABLE condition never held in this environment (Qt6
+# discovery takes the minimal path) and the Qt6_WebSockets variable was
+# never defined, so the websocket code compiled without the module on
+# the link line.
+if(QT6_WEBSOCKETS_REAL_FOUND OR Qt6WebSockets_FOUND)
+  set(Qt6_WebSockets Qt6::WebSockets)
 else()
   set(Qt6_WebSockets "")
 endif()