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-rw-r--r--ext/-test-/dln/empty/empty.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/ext/-test-/dln/empty/empty.c b/ext/-test-/dln/empty/empty.c
index c4f94f1644..2b4fd42cd2 100644
--- a/ext/-test-/dln/empty/empty.c
+++ b/ext/-test-/dln/empty/empty.c
@@ -1,3 +1,5 @@
+#include "ruby.h"
+
void
Init_empty(void)
{