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-rw-r--r--missing/finite.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/missing/finite.c b/missing/finite.c
index 8d0b7af262..ab7686317b 100644
--- a/missing/finite.c
+++ b/missing/finite.c
@@ -1,5 +1,7 @@
/* public domain rewrite of finite(3) */
+#include "ruby/missing.h"
+
int
finite(double n)
{