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-rw-r--r--hurd/hurd.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/hurd/hurd.h b/hurd/hurd.h
index 7e72bf6cf3..eb445d481a 100644
--- a/hurd/hurd.h
+++ b/hurd/hurd.h
@@ -303,4 +303,11 @@ extern int hurd_check_cancel (void);
 extern io_t __getdport (int fd), getdport (int fd);
 
 
+#include <stdarg.h>
+
+/* Write formatted output to PORT, a Mach port supporting the i/o protocol,
+   according to the format string FORMAT, using the argument list in ARG.  */
+int vpprintf (io_t port, const char *format, va_list arg);
+
+
 #endif	/* hurd.h */