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-rw-r--r--include/ruby/ruby.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/ruby/ruby.h b/include/ruby/ruby.h
index 440bfe2ed1..8e8486b105 100644
--- a/include/ruby/ruby.h
+++ b/include/ruby/ruby.h
@@ -1220,6 +1220,7 @@ typedef struct rb_event_hook_struct {
struct rb_event_hook_struct *next;
} rb_event_hook_t;
+#define RB_EVENT_HOOKS_HAVE_CALLBACK_DATA 1
void rb_add_event_hook(rb_event_hook_func_t func, rb_event_flag_t events,
VALUE data);
int rb_remove_event_hook(rb_event_hook_func_t func);