1 files changed, 3 insertions, 0 deletions
diff --git a/src/drivers/Xlib/Fl_Xlib_Graphics_Driver.h b/src/drivers/Xlib/Fl_Xlib_Graphics_Driver.h
index 276316213..7c1f4799a 100644
--- a/src/drivers/Xlib/Fl_Xlib_Graphics_Driver.h
+++ b/src/drivers/Xlib/Fl_Xlib_Graphics_Driver.h
@@ -35,6 +35,9 @@
 class FL_EXPORT Fl_Xlib_Graphics_Driver : public Fl_Graphics_Driver {
 protected:
   static GC gc_;
+  uchar **mask_bitmap_;
+  uchar **mask_bitmap() {return mask_bitmap_;}
+  void mask_bitmap(uchar **value) { mask_bitmap_ = value; }
 public:
   static const char *class_id;
   Fl_Xlib_Graphics_Driver(void);