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-rw-r--r--include/stdio_ext.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/include/stdio_ext.h b/include/stdio_ext.h
index 09db6f2c9c..31c7a4e7a1 100644
--- a/include/stdio_ext.h
+++ b/include/stdio_ext.h
@@ -2,4 +2,10 @@
 
 # include <stdio-common/stdio_ext.h>
 
+extern int __fsetlocking_internal (FILE *__fp, int __type) attribute_hidden;
+
+#ifndef NOT_IN_libc
+# define __fsetlocking(fp, type) INTUSE(__fsetlocking) (fp, type)
+#endif
+
 #endif