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-rw-r--r--libio/libioP.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/libio/libioP.h b/libio/libioP.h
index 8525b71827..ac4df17ce8 100644
--- a/libio/libioP.h
+++ b/libio/libioP.h
@@ -26,6 +26,7 @@ the executable file might be covered by the GNU General Public License. */
 #ifndef errno
 extern int errno;
 #endif
+#include <libc-lock.h>
 
 #include "iolibio.h"