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-rw-r--r--missing/isnan.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/missing/isnan.c b/missing/isnan.c
index a8733978ad..5846947f50 100644
--- a/missing/isnan.c
+++ b/missing/isnan.c
@@ -1,5 +1,7 @@
/* public domain rewrite of isnan(3) */
+#include "ruby/missing.h"
+
static int double_ne(double n1, double n2);
int