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-rw-r--r--include/libio.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/libio.h b/include/libio.h
index 735941d230..97fc5b548b 100644
--- a/include/libio.h
+++ b/include/libio.h
@@ -1,3 +1,6 @@
+#if !defined _ISOMAC && defined _IO_MTSAFE_IO
+# include <stdio-lock.h>
+#endif
#include <libio/libio.h>
#ifndef _ISOMAC