void wxSetIconsX11( WXDisplay* display, WXWindow window,
                     const wxIconBundle& ib )
 {
+#if !wxUSE_NANOX
     size_t size = 0;
     size_t i, max = ib.m_icons.GetCount();
 
                 gMask = image.GetMaskGreen();
                 bMask = image.GetMaskBlue();
             }
+            else // no mask, but still init the variables to avoid warnings
+            {
+                rMask =
+                gMask =
+                bMask = 0;
+            }
 
             *ptr++ = width;
             *ptr++ = height;
                          (Window)window,
                          net_wm_icon );
     }
+#endif
 }
 
 #endif