diff --git a/headers/posix/stdio_ext.h b/headers/posix/stdio_ext.h
new file mode 100644
index 0000000000..e5f3a6e773
--- /dev/null
+++ b/headers/posix/stdio_ext.h
@@ -0,0 +1,36 @@
+/*
+ * Copyright 2008, Haiku Inc. All Rights Reserved.
+ * Distributed under the terms of the MIT/X11 License.
+ */
+#ifndef _STDIO_EXT_H_
+#define _STDIO_EXT_H_
+
+#include <stdio.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define FSETLOCKING_QUERY		0
+#define FSETLOCKING_INTERNAL	1
+#define FSETLOCKING_BYCALLER	2
+
+/* The following stdio extensions are not implemented yet */
+/* extern size_t	__fufsize(FILE* stream); */
+/* extern int		__freading(FILE* stream); */
+/* extern int		__fwriting(FILE* stream); */
+/* extern int		__freadable(FILE* stream); */
+/* extern int		__fwritable(FILE* stream); */
+/* extern int		__flbf(FILE* stream); */
+/* extern void		__fpurge(FILE* stream); */
+/* extern size_t	__fpending(FILE* stream); */
+
+extern void		_flushlbf(void);
+extern int		__fsetlocking(FILE* stream, int type);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _STDIO_EXT_H_ */
+