diff -urpN cygwin.org/include/sys/_types.h cygwin/include/sys/_types.h
--- cygwin.org/include/sys/_types.h	1970-01-01 01:00:00.000000000 +0100
+++ cygwin/include/sys/_types.h	2004-01-12 08:02:01.775041600 +0100
@@ -0,0 +1,37 @@
+/* ANSI C namespace clean utility typedefs */
+
+/* This file defines various typedefs needed by the system calls that support
+   the C library.  Basically, they're just the POSIX versions with an '_'
+   prepended.  This file lives in the `sys' directory so targets can provide
+   their own if desired (or they can put target dependant conditionals here).
+*/
+
+#ifndef	_SYS__TYPES_H
+#define _SYS__TYPES_H
+
+typedef long _off_t;
+__extension__ typedef long long _off64_t;
+
+#if defined(__INT_MAX__) && __INT_MAX__ == 2147483647
+typedef int _ssize_t;
+#else
+typedef long _ssize_t;
+#endif
+
+#define __need_wint_t
+#include <stddef.h>
+
+/* Conversion state information.  */
+typedef struct
+{
+  int __count;
+  union
+  {
+    wint_t __wch;
+    unsigned char __wchb[4];
+  } __value;		/* Value so far.  */
+} _mbstate_t;
+
+typedef void *_flock_t;
+
+#endif	/* _SYS__TYPES_H */
diff -urpN cygwin.org/include/sys/lock.h cygwin/include/sys/lock.h
--- cygwin.org/include/sys/lock.h	1970-01-01 01:00:00.000000000 +0100
+++ cygwin/include/sys/lock.h	2004-01-12 08:11:50.050940800 +0100
@@ -0,0 +1,21 @@
+/* sys/lock.h
+
+   Copyright 2004 Red Hat, Inc.
+
+This file is part of Cygwin.
+
+This software is a copyrighted work licensed under the terms of the
+Cygwin license.  Please consult the file "CYGWIN_LICENSE" for
+details. */
+
+#ifndef _SYS_LOCK_H_
+#define _SYS_LOCK_H_
+
+typedef void *_LOCK_RECURSIVE_T;
+
+#define __lock_init_recursive(__lock) __cygwin_lock_init_recursive(&__lock)
+#define __lock_acquire_recursive(__lock) __cygwin_lock_lock_recursive(&__lock)
+#define __lock_release_recursive(__lock) __cygwin_lock_unlock_recursive(&__lock)
+#define __lock_close_recursive(__lock) __cygwin_lock_fini_recursive(&__lock)
+
+#endif
diff -urpN cygwin.org/include/sys/stdio.h cygwin/include/sys/stdio.h
--- cygwin.org/include/sys/stdio.h	1970-01-01 01:00:00.000000000 +0100
+++ cygwin/include/sys/stdio.h	2004-01-09 15:34:16.245785600 +0100
@@ -0,0 +1,23 @@
+/* sys/stdio.h
+
+   Copyright 2004 Red Hat, Inc.
+
+This file is part of Cygwin.
+
+This software is a copyrighted work licensed under the terms of the
+Cygwin license.  Please consult the file "CYGWIN_LICENSE" for
+details. */
+
+#ifndef _SYS_STDIO_H_
+#define _SYS_STDIO_H_
+
+#if !defined(__SINGLE_THREAD__)
+#  if !defined(_flockfile)
+#    define _flockfile(fp) __cygwin_flockfile(fp)
+#  endif
+#  if !defined(_funlockfile)
+#    define _funlockfile(fp) __cygwin_funlockfile(fp)
+#  endif
+#endif
+ 
+#endif
diff -urpN cygwin.org/thread.cc cygwin/thread.cc
--- cygwin.org/thread.cc	2003-12-23 17:27:53.000000000 +0100
+++ cygwin/thread.cc	2004-01-12 10:38:03.501873600 +0100
@@ -44,6 +44,7 @@ details. */
 #include <sys/timeb.h>
 #include <exceptions.h>
 #include <sys/fcntl.h>
+#include <sys/lock.h>
 
 extern int threadsafe;
 
@@ -54,6 +55,43 @@ __getreent ()
   return &_my_tls.local_clib;
 }
 
+extern "C" void
+__cygwin_lock_init_recursive (_LOCK_RECURSIVE_T *lock)
+{
+  if (!pthread_mutex_init ((pthread_mutex_t*) lock, NULL))
+    (*(pthread_mutex_t*)lock)->type = PTHREAD_MUTEX_RECURSIVE;
+}
+
+extern "C" void
+__cygwin_lock_fini_recursive (_LOCK_RECURSIVE_T *lock)
+{
+  pthread_mutex_destroy ((pthread_mutex_t*) lock);
+}
+
+extern "C" void
+__cygwin_lock_lock_recursive (_LOCK_RECURSIVE_T *lock)
+{
+  pthread_mutex_lock ((pthread_mutex_t*) lock);
+}
+
+extern "C" void
+__cygwin_lock_unlock_recursive (_LOCK_RECURSIVE_T *lock)
+{
+  pthread_mutex_unlock ((pthread_mutex_t*) lock);
+}
+ 
+extern "C" void
+__cygwin_flockfile (FILE *stream)
+{
+  __cygwin_lock_lock_recursive ((_LOCK_RECURSIVE_T *)&stream->_lock);
+}
+ 
+extern "C" void
+__cygwin_funlockfile (FILE *stream)
+{
+  __cygwin_lock_unlock_recursive ((_LOCK_RECURSIVE_T *)&stream->_lock);
+}
+ 
 inline LPCRITICAL_SECTION
 ResourceLocks::Lock (int _resid)
 {