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-rw-r--r--missing/hypot.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/missing/hypot.c b/missing/hypot.c
index 5a663553cf..765581bacb 100644
--- a/missing/hypot.c
+++ b/missing/hypot.c
@@ -1,5 +1,6 @@
/* public domain rewrite of hypot */
+#include "ruby/missing.h"
#include <math.h>
double hypot(double x, double y)