diff --git a/newlib/ChangeLog b/newlib/ChangeLog
index c5013d5fe..e0034a951 100644
--- a/newlib/ChangeLog
+++ b/newlib/ChangeLog
@@ -1,3 +1,8 @@
+2008-03-27  Corinna Vinschen  <corinna@vinschen.de>
+
+	* libc/include/sys/unistd.h: Declare lockf(2) and define lockf
+	constants when building for Cygwin.
+
 2008-03-11  Jeff Johnston  <jjohnstn@redhat.com>
 
 	* libc/stdio/rgetc.c (__srget_r): Invoke CHECK_INIT to ensure
diff --git a/newlib/libc/include/sys/unistd.h b/newlib/libc/include/sys/unistd.h
index 072e6fe71..025951819 100644
--- a/newlib/libc/include/sys/unistd.h
+++ b/newlib/libc/include/sys/unistd.h
@@ -103,7 +103,7 @@ int	_EXFUN(nice, (int __nice_value ));
 #if !defined(__INSIDE_CYGWIN__)
 off_t   _EXFUN(lseek, (int __fildes, off_t __offset, int __whence ));
 #endif
-#if defined(__SPU__)
+#if defined(__SPU__) || defined(__CYGWIN__)
 #define F_ULOCK	0
 #define F_LOCK	1
 #define F_TLOCK	2