diff --git a/libdw/dwarf_decl_file.c b/libdw/dwarf_decl_file.c
new file mode 100644
index 0000000..5657132
--- /dev/null
+++ b/libdw/dwarf_decl_file.c
@@ -0,0 +1,89 @@
+/* Return file name containing definition of the given function.
+   Copyright (C) 2005, 2009 Red Hat, Inc.
+   This file is part of elfutils.
+   Written by Ulrich Drepper <drepper@redhat.com>, 2005.
+
+   This file is free software; you can redistribute it and/or modify
+   it under the terms of either
+
+     * the GNU Lesser General Public License as published by the Free
+       Software Foundation; either version 3 of the License, or (at
+       your option) any later version
+
+   or
+
+     * the GNU General Public License as published by the Free
+       Software Foundation; either version 2 of the License, or (at
+       your option) any later version
+
+   or both in parallel, as here.
+
+   elfutils 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 copies of the GNU General Public License and
+   the GNU Lesser General Public License along with this program.  If
+   not, see <http://www.gnu.org/licenses/>.  */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <assert.h>
+#include <dwarf.h>
+#include "libdwP.h"
+
+
+const char *
+dwarf_decl_file (Dwarf_Die *die)
+{
+  Dwarf_Attribute attr_mem;
+  Dwarf_Word idx = 0;
+
+  if (INTUSE(dwarf_formudata) (INTUSE(dwarf_attr_integrate)
+			       (die, DW_AT_decl_file, &attr_mem),
+			       &idx) != 0)
+    return NULL;
+
+  /* Zero means no source file information available.  */
+  if (idx == 0)
+    {
+      __libdw_seterrno (DWARF_E_NO_ENTRY);
+      return NULL;
+    }
+
+  /* Get the array of source files for the CU.  */
+  struct Dwarf_CU *cu = die->cu;
+  if (cu->lines == NULL)
+    {
+      Dwarf_Lines *lines;
+      size_t nlines;
+
+      /* Let the more generic function do the work.  It'll create more
+	 data but that will be needed in an real program anyway.  */
+      (void) INTUSE(dwarf_getsrclines) (&CUDIE (cu), &lines, &nlines);
+      assert (cu->lines != NULL);
+    }
+
+  if (cu->lines == (void *) -1l)
+    {
+      /* If the file index is not zero, there must be file information
+	 available.  */
+      __libdw_seterrno (DWARF_E_INVALID_DWARF);
+      return NULL;
+    }
+
+  assert (cu->files != NULL && cu->files != (void *) -1l);
+
+  if (idx >= cu->files->nfiles)
+    {
+      __libdw_seterrno (DWARF_E_INVALID_DWARF);
+      return NULL;
+    }
+
+  return cu->files->info[idx].name;
+}
+OLD_VERSION (dwarf_decl_file, ELFUTILS_0.122)
+NEW_VERSION (dwarf_decl_file, ELFUTILS_0.143)