--- gcc/objc/list.h	2018/04/24 18:10:18	1.1.1.1
+++ gcc/objc/list.h	2018/04/24 18:20:18	1.1.1.2
@@ -1,22 +1,23 @@
 /* Generic single linked list to keep various information 
-   Copyright (C) 1993 Free Software Foundation, Inc.
+   Copyright (C) 1993, 1994 Free Software Foundation, Inc.
 
 Author: Kresten Krab Thorup
 
 This file is part of GNU CC.
 
-GNU CC is free software; you can redistribute it and/or modify it under the
-   terms of the GNU General Public License as published by the Free Software
-   Foundation; either version 2, or (at your option) any later version.
-
-GNU CC is distributed in the hope that it will be useful, but WITHOUT ANY
-   WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
-   FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
-   details.
-
-You should have received a copy of the GNU General Public License along with
-   GNU CC; see the file COPYING.  If not, write to the Free Software
-   Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
+GNU CC is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU CC is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU CC; see the file COPYING.  If not, write to
+the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
 
 /* As a special exception, if you link this library with files compiled with
    GCC to produce an executable, this does not cause the resulting executable
@@ -24,6 +25,8 @@ You should have received a copy of the G
    however invalidate any other reasons why the executable file might be
    covered by the GNU General Public License.  */
 
+#ifndef __GNU_OBJC_LIST_H
+#define __GNU_OBJC_LIST_H
 void * __objc_xrealloc (void *optr, size_t size);
 void * __objc_xmalloc (size_t size);
 
@@ -143,3 +146,4 @@ list_free(struct objc_list* list)
       free(list);
     }
 }
+#endif __GNU_OBJC_LIST_H