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-rw-r--r--runtime/user/io.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/runtime/user/io.c b/runtime/user/io.c
index 2da0de82..ff4a06a7 100644
--- a/runtime/user/io.c
+++ b/runtime/user/io.c
@@ -9,6 +9,7 @@
#ifndef _IO_C_
#define _IO_C_
+int vprintf(const char *format, va_list ap);
/** Logs Data.
* This function sends the message immediately to stpd. It