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-rw-r--r--src/Fl_System_Driver.H2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/Fl_System_Driver.H b/src/Fl_System_Driver.H
index 59bf1de1a..165115e1e 100644
--- a/src/Fl_System_Driver.H
+++ b/src/Fl_System_Driver.H
@@ -241,6 +241,8 @@ public:
virtual const char *alt_name() { return "Alt"; }
virtual const char *control_name() { return "Ctrl"; }
virtual Fl_Sys_Menu_Bar_Driver *sys_menu_bar_driver() { return NULL; }
+ virtual void lock_ring() {}
+ virtual void unlock_ring() {}
};
#endif // FL_SYSTEM_DRIVER_H