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-rw-r--r--m4/output.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/m4/output.c b/m4/output.c
index b2f6530a..0535d93a 100644
--- a/m4/output.c
+++ b/m4/output.c
@@ -1,6 +1,6 @@
/* GNU m4 -- A simple macro processor
Copyright (C) 1989, 1990, 1991, 1992, 1993, 1994, 1998, 2002, 2004,
- 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
+ 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
This file is part of GNU M4.
@@ -26,6 +26,7 @@
#include "clean-temp.h"
#include "exitfail.h"
#include "gl_avltree_oset.h"
+#include "gl_xoset.h"
#include "intprops.h"
#include "quotearg.h"
#include "xvasprintf.h"