Adds latest migration results

qt6-after/qt6-migrated-legatus/Lts/Plugins/OnlineHelp/Gui/OnlineHelpViewer/CMakeLists.txt

@@ -5,6 +5,14 @@
 # Created by Astrid Müller, SGAS, 2018-04-10
 #
 
+# Make ${Qt6_Widgets} optional
+if(QT6_GUI_AVAILABLE AND TARGET Qt6::Widgets)
+  set(Qt6_Widgets ${Qt6_Widgets})
+else()
+  set(Qt6_Widgets "")
+endif()
+
+
 SET(online_help_viewer_gui_SRCS
   online_help_viewer_gui_plugin.cpp
   online_help_viewer_gui_plugin.h
@@ -18,16 +26,18 @@ NGL_WRAP_UI(online_help_viewer_gui_SRCS
 )
 
 NGL_ADD_LIBRARY(WS OhpOnlineHelpViewerGuiPlugin MODULE ${online_help_viewer_gui_SRCS})
-NGL_TARGET_LINK_LIBRARIES(OhpOnlineHelpViewerGuiPlugin
-  OhpOnlineHelpViewerGuiPluginInterface
-  ngltranslator
-  GuiPluginInterface
-  Qt6::Widgets
-  Qt6::WebEngineWidgets
-  LtsSession
-  ngltools
-  NGLLogger
-)
+if(QT6_GUI_AVAILABLE)
+  NGL_TARGET_LINK_LIBRARIES(OhpOnlineHelpViewerGuiPlugin
+    OhpOnlineHelpViewerGuiPluginInterface
+    ngltranslator
+    GuiPluginInterface
+    ${Qt6_Widgets}
+    Qt6::WebEngineWidgets
+    LtsSession
+    ngltools
+    NGLLogger
+  )
+endif()
 
 NGL_INSTALL_TARGET(OhpOnlineHelpViewerGuiPlugin)