if (flags & wxQUANTIZE_FILL_DESTINATION_IMAGE)
     {
-        if (!dest.Ok())
+        if (!dest.IsOk())
             dest.Create(w, h);
 
         imgdt = dest.GetData();
         delete[] g;
         delete[] b;
     }
-#endif // wxUSE_PALETTE
+#else // !wxUSE_PALETTE
+    wxUnusedVar(pPalette);
+#endif // wxUSE_PALETTE/!wxUSE_PALETTE
 
     return true;
 }