diff --git a/gcc/coretypes.h b/gcc/coretypes.h
deleted file mode 100644
index 985c1cfd65b..00000000000
--- a/gcc/coretypes.h
+++ /dev/null
@@ -1,58 +0,0 @@
-/* GCC core type declarations.
-   Copyright (C) 2002 Free Software Foundation, Inc.
-
-This file is part of GCC.
-
-GCC 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.
-
-GCC 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 GCC; see the file COPYING.  If not, write to the Free
-Software Foundation, 59 Temple Place - Suite 330, Boston, MA
-02111-1307, USA.  */
-
-/* Provide forward declarations of core types which are referred to by
-   most of the compiler.  This allows header files to use these types
-   (e.g. in function prototypes) without concern for whether the full
-   definitions are visible.  Some other declarations that need to be
-   universally visible are here, too.
-
-   In the context of tconfig.h, most of these have special definitions
-   which prevent them from being used except in further type
-   declarations.  This is a kludge; the right thing is to avoid
-   including the "tm.h" header set in the context of tconfig.h, but
-   we're not there yet.  */
-
-#ifndef GCC_CORETYPES_H
-#define GCC_CORETYPES_H
-
-#define GTY(x)  /* nothing - marker for gengtype */
-
-#ifndef USED_FOR_TARGET
-
-struct rtx_def;
-typedef struct rtx_def *rtx;
-struct rtvec_def;
-typedef struct rtvec_def *rtvec;
-union tree_node;
-typedef union tree_node *tree;
-
-#else
-
-struct _dont_use_rtx_here_;
-struct _dont_use_rtvec_here_;
-union _dont_use_tree_here_;
-#define rtx struct _dont_use_rtx_here_ *
-#define rtvec struct _dont_use_rtvec_here *
-#define tree union _dont_use_tree_here_ *
-
-#endif
-
-#endif /* coretypes.h */
diff --git a/gcc/unwind-dw2-fde-darwin.c b/gcc/unwind-dw2-fde-darwin.c
index d7350e55f53..77e44e852ad 100644
--- a/gcc/unwind-dw2-fde-darwin.c
+++ b/gcc/unwind-dw2-fde-darwin.c
@@ -27,9 +27,8 @@
 /* Locate the FDE entry for a given address, using Darwin's keymgr support.  */
 
 #include "tconfig.h"
-#include "tsystem.h"
-#include "coretypes.h"
-#include "tm.h"
+#include <string.h>
+#include <stdlib.h>
 #include "dwarf2.h"
 #include "unwind.h"
 #define NO_BASE_OF_ENCODED_VALUE