Migrates cmake targets under folder ./Z to Qt6

qt6-after/qt6-migrated-legatus/Z/src/nglwidgets/CMakeLists.txt

@@ -57,21 +57,27 @@ SET(nglwidgets_SRCS
     ngldialog.h
     nglmainwindow.cpp
     nglmainwindow.h
-    nglpdfdocument.cpp
-    nglpdfdocument.h
-    nglpdfpage.cpp
-    nglpdfpage.h
     nglstandardbutton.cpp
     nglstandardbutton.h
     ngltreeitem.cpp
     ngltreeitem.h
     ngltreemodel.cpp
     ngltreemodel.h
-    nglpdfwidget.cpp
-    nglpdfwidget.h
     nglwidgets_export.h
 )
 
+# PDF support files - only included when Poppler-Qt6 is available
+if(HAVE_POPPLER_QT6)
+  list(APPEND nglwidgets_SRCS
+    nglpdfdocument.cpp
+    nglpdfdocument.h
+    nglpdfpage.cpp
+    nglpdfpage.h
+    nglpdfwidget.cpp
+    nglpdfwidget.h
+  )
+endif()
+
 NGL_WRAP_UI(nglwidgets_SRCS
     nglpdfwidget.ui
 )