2 files changed, 19 insertions, 0 deletions
diff --git a/newlib/libc/include/stdio.h b/newlib/libc/include/stdio.h
index 9fb9451e4..767438fac 100644
--- a/newlib/libc/include/stdio.h
+++ b/newlib/libc/include/stdio.h
@@ -47,6 +47,8 @@ extern "C" {
 
 #include <sys/reent.h>
 
+#include <sys/stdio.h>
+
 typedef _fpos_t fpos_t;
 
 typedef struct __sFILE FILE;
@@ -220,6 +222,9 @@ FILE *  _EXFUN(popen, (const char *, const char *));
 int	_EXFUN(putw, (int, FILE *));
 void    _EXFUN(setbuffer, (FILE *, char *, int));
 int	_EXFUN(setlinebuf, (FILE *));
+void    _EXFUN(flockfile, (FILE *));
+int     _EXFUN(ftrylockfile, (FILE *));
+void    _EXFUN(funlockfile, (FILE *));
 #endif
 
 /*
diff --git a/newlib/libc/include/sys/stdio.h b/newlib/libc/include/sys/stdio.h
new file mode 100644
index 000000000..8177322a0
--- /dev/null
+++ b/newlib/libc/include/sys/stdio.h
@@ -0,0 +1,14 @@
+#ifndef _NEWLIB_STDIO_H
+#define _NEWLIB_STDIO_H
+
+/* Internal locking macros, used to protect stdio functions.  In the
+   general case, expand to nothing. */
+#if !defined(_flockfile)
+#  define _flockfile(fp)
+#endif
+
+#if !defined(_funlockfile)
+#  define _funlockfile(fp)
+#endif
+
+#endif /* _NEWLIB_STDIO_H */