1 files changed, 3 insertions, 0 deletions
diff --git a/FL/Fl_Screen_Driver.H b/FL/Fl_Screen_Driver.H
index df917a066..00d3d763d 100644
--- a/FL/Fl_Screen_Driver.H
+++ b/FL/Fl_Screen_Driver.H
@@ -180,6 +180,9 @@ public:
   /* Number of pixels per drawing unit for the display.
      The default implementation may be enough. */
   virtual float retina_factor() { return 1; }
+  // The default implementation of the next 2 functions may be enough.
+  virtual int run_also_windowless();
+  virtual int wait_also_windowless(double delay);
 };