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-rw-r--r--missing/erf.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/missing/erf.c b/missing/erf.c
index fe65b9a479..d72c4eaf4e 100644
--- a/missing/erf.c
+++ b/missing/erf.c
@@ -3,6 +3,7 @@
reference - Haruhiko Okumura: C-gengo niyoru saishin algorithm jiten
(New Algorithm handbook in C language) (Gijyutsu hyouron
sha, Tokyo, 1991) p.227 [in Japanese] */
+#include "ruby/missing.h"
#include <stdio.h>
#include <math.h>