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-rw-r--r--ext/fiddle/closure.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/ext/fiddle/closure.c b/ext/fiddle/closure.c
index f19091b..1a80b2b 100644
--- a/ext/fiddle/closure.c
+++ b/ext/fiddle/closure.c
@@ -1,6 +1,7 @@
#include <fiddle.h>
#include <ruby/thread.h>
-#include "internal.h" /* rb_thread_has_gvl_p */
+
+int ruby_thread_has_gvl_p(void); /* from internal.h */
VALUE cFiddleClosure;