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-rw-r--r--ext/syck/syck.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/syck/syck.h b/ext/syck/syck.h
index 7497576483..bd5c65858b 100644
--- a/ext/syck/syck.h
+++ b/ext/syck/syck.h
@@ -16,6 +16,7 @@
#define SYCK_VERSION "0.41"
#define YAML_DOMAIN "yaml.org,2002"
+#include <stdio.h>
#include "st.h"
#if defined(__cplusplus)